You searched for subject:(Weighting).
Showing records 1 – 30 of
317 total matches.
◁ [1] [2] [3] [4] [5] … [11] ▶
1.
Geiger, Melanie.
Multimodal information retrieval.
Degree: 2018, Université de Neuchâtel
URL: http://doc.rero.ch/record/323629 
► Les processus basés sur le savoir, une des composantes essentielles de notre économie, requiert souvent un système multimodal de recherche d’information. De tels systèmes doivent…
(more)
▼ Les processus basés sur le savoir, une des composantes
essentielles de notre économie, requiert souvent un système
multimodal de recherche d’information. De tels systèmes doivent
traiter des collections de documents et des requêtes de plus en
plus complexes. Cette complexité sous-jacente se situe dans le
grand nombre et la diversité des modalités textuelles ou
non-textuelles comme les coordonnées géographiques, les indications
temporelles, ou les cotations apparaissant dans les documents. La
combinaison de toutes ces modalités rend quasi-impossible la mise
au point de nouvelles approches pour chaque modalité potentielle ou
d’obtenir suffisamment de données d’apprentissage. Dès lors, l’un
des objectifs de ce travail de thèse est de proposer un modèle
unifié afin de traiter les diverses modalités en recherche
d’information. De plus, nous avons développé des méthodes
permettant la fusion de modalités avec peu ou en l’absence de
données d’entrainement. Une telle contrainte s’avère essentielle
pour des méthodes pouvant s’appliquer à un large éventail
d’applications ou de domaines. Nous avons fondé notre
approche sur notre expérience touchant de nombreux systèmes
multimodaux de recherche d’information. Dans un premier temps nous
présentons une approche basée sur une distinction fondée sur deux
types de modalités que nous subdiviserons par la suite. Ce choix
correspond à une première approche dont l’objectif est de réduire
le nombre possible de modèles. Elle permet de généraliser des
méthodes traitant plusieurs modalités au lieu d’être spécifiques à
une unique modalité. Comme les schémas de pondération les
plus populaires pour le dépistage d’information textuelle se sont
généralisés avec succès dans de nombreuses tâches de recherche,
nous les avons adoptés comme fondement à nos modèles unifiés
traitant diverses modalités. Dans un deuxième temps, nous
démontrons comment les trois composantes principales du modèle BM25
(fréquence d’occurrence, fréquence documentaire et normalisation
selon la longueur du document) peuvent être redéfinies pour pouvoir
traiter des modalités non-textuelles. Dans un troisième
temps, nous définissons des lignes directrices pour l’intégration
de plusieurs modalités dans un système de dépistage de
l’information. Dans ce but, BM25 s’avère un système de pondération
permettant la fusion de modalités sous l’hypothèse des scores bruts
(raw-score). Ce but est atteint par l’usage d’une approche basée
sur l’échantillonnage qui est utilisée pour démontrer que BM25
satisfait les hypothèses de la fusion par les scores bruts (la
longueur moyenne des documents et la variance de
celle-ci). En se basant sur notre redéfinition du modèle
BM25 pouvant traiter à la fois les modalités textuelles et
non-textuelles, nous avons testé notre approche par rapport à
différentes références ainsi que lors de campagnes d’évaluation
internationales de même que dans des contextes de production. Nous
avons démontré que notre approche sans données d’apprentissage
retournait une performance significativement supérieure…
Advisors/Committee Members: Jacques (Dir.), Martin (Codir.).
Subjects/Keywords: BM25 Weighting Scheme
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Geiger, M. (2018). Multimodal information retrieval. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/323629
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Geiger, Melanie. “Multimodal information retrieval.” 2018. Thesis, Université de Neuchâtel. Accessed January 21, 2021.
http://doc.rero.ch/record/323629.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Geiger, Melanie. “Multimodal information retrieval.” 2018. Web. 21 Jan 2021.
Vancouver:
Geiger M. Multimodal information retrieval. [Internet] [Thesis]. Université de Neuchâtel; 2018. [cited 2021 Jan 21].
Available from: http://doc.rero.ch/record/323629.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Geiger M. Multimodal information retrieval. [Thesis]. Université de Neuchâtel; 2018. Available from: http://doc.rero.ch/record/323629
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Western Michigan University
2.
Helenius, Laars C.
Edge Induced Weightings of Uniform Hypergraphs and Related Problems.
Degree: PhD, Mathematics, 2018, Western Michigan University
URL: https://scholarworks.wmich.edu/dissertations/3227
► The starting point of the research is the so called 1-2-3 Conjecture formulated in 2004 by Karoński, Luczak, and Thomason. Roughly speaking it says…
(more)
▼ The starting point of the research is the so called
1-2-3 Conjecture formulated in 2004 by Karoński, Luczak, and Thomason. Roughly speaking it says that the edges of any graph can be weighted from {1, 2, 3} so that the induced vertex coloring (as the sum of weights adjacent to a given vertex) is proper. The conjecture has attracted a lot of interest from researchers over the last decade but is still unanswered. More recently, the conjecture has been studied for hypergraphs.
The main result of this dissertation shows in particular that an analogous conjecture holds for almost all uniform hypergraphs. Additionally, it also studies how other sets with binary operations, e.g. nite abelian groups, can be used to color hypergraph edges, how hypergraphs are connected by a certain type of path structure, and calculates the threshold probability in a random hypergraph for the appearance of the related cycle structure.
Advisors/Committee Members: Dr. Andrzej Dudek, Dr. Patrick Bennett, Dr. David Galvin.
Subjects/Keywords: 123 conjecture; hypergraphs; strong weighting; weak weighting; Mathematics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Helenius, L. C. (2018). Edge Induced Weightings of Uniform Hypergraphs and Related Problems. (Doctoral Dissertation). Western Michigan University. Retrieved from https://scholarworks.wmich.edu/dissertations/3227
Chicago Manual of Style (16th Edition):
Helenius, Laars C. “Edge Induced Weightings of Uniform Hypergraphs and Related Problems.” 2018. Doctoral Dissertation, Western Michigan University. Accessed January 21, 2021.
https://scholarworks.wmich.edu/dissertations/3227.
MLA Handbook (7th Edition):
Helenius, Laars C. “Edge Induced Weightings of Uniform Hypergraphs and Related Problems.” 2018. Web. 21 Jan 2021.
Vancouver:
Helenius LC. Edge Induced Weightings of Uniform Hypergraphs and Related Problems. [Internet] [Doctoral dissertation]. Western Michigan University; 2018. [cited 2021 Jan 21].
Available from: https://scholarworks.wmich.edu/dissertations/3227.
Council of Science Editors:
Helenius LC. Edge Induced Weightings of Uniform Hypergraphs and Related Problems. [Doctoral Dissertation]. Western Michigan University; 2018. Available from: https://scholarworks.wmich.edu/dissertations/3227
Vanderbilt University
3.
Diedesch, Anna Colleen.
Binaural-cue weighting in sound localization with open-fit hearing aids and in simulated reverberation.
Degree: PhD, Hearing and Speech Sciences, 2016, Vanderbilt University
URL: http://hdl.handle.net/1803/13402
► Interaural time (ITD) and level differences (ILD) are susceptible to distortion by multipath acoustics due to reverberation, echoes, and potentially with open-fit, behind-the-ear (BTE) hearing…
(more)
▼ Interaural time (ITD) and level differences (ILD) are susceptible to distortion by multipath acoustics due to reverberation, echoes, and potentially with open-fit, behind-the-ear (BTE) hearing aids, which pose an additional delay between acoustic and processed sound (~2-5ms). Here, ten young, normal hearing listeners localized broadband and narrowband (500, 4000, 500+4000 Hz) noise. Listeners were fit with linear amplification and evaluated in three aided conditions: unaided, open-fit, and occluded BTE coupling. Sounds were presented from 64 loudspeakers covering 360º azimuth in an anechoic chamber. Twenty-three target locations were evaluated, spanning ±61º. Sounds were presented in three virtual acoustic environments: anechoic, single virtual wall, and simulated 10m X 10m room. The virtual wall was 80% reflective (α=0.2) and oriented parallel to the listener’s forward gaze, at a distance of 5m to the right. The room condition simulated four virtual walls (α=0.5), 5m to the left and right, 6.67m in front, and 3.33m behind the listening position.
Performance was assessed across conditions by measuring localization gain (slope), localization variance, localization error, and front-back confusion rate. Results showed greater variability in the simulated room than anechoic conditions, particularly for aided conditions (occluded > open > unaided). Aided listening compressed localization gain at 4000 Hz and expanded gain at 500 Hz. Errors were generally reduced when 500 and 4000 Hz were played simultaneously.
Additionally, in-ear acoustic recordings of broadband noise were made in all aided and room conditions. Binaural cross-correlation and intensity-difference calculation were used to estimate frequency-specific ITD and ILD, respectively, from the recordings. Consistent with previous research, ITD became erratic and ILD diminished in simulated rooms compared to anechoic. Effects of hearing aid venting were less noticeable. Finally, results were quantified in the form of binaural-cue
weighting (ITD/ILD “trading ratio”) on the basis of measured interaural cue values extracted from in-ear recordings obtained for each listener and condition.
Advisors/Committee Members: Todd A. Ricketts (committee member), D. Wesley Grantham (committee member), Daniel H. Ashmead (committee member), Frederick J. Gallun (committee member), G. Christopher Stecker (Committee Chair).
Subjects/Keywords: sound localization; amplification; binaural cue-weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Diedesch, A. C. (2016). Binaural-cue weighting in sound localization with open-fit hearing aids and in simulated reverberation. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13402
Chicago Manual of Style (16th Edition):
Diedesch, Anna Colleen. “Binaural-cue weighting in sound localization with open-fit hearing aids and in simulated reverberation.” 2016. Doctoral Dissertation, Vanderbilt University. Accessed January 21, 2021.
http://hdl.handle.net/1803/13402.
MLA Handbook (7th Edition):
Diedesch, Anna Colleen. “Binaural-cue weighting in sound localization with open-fit hearing aids and in simulated reverberation.” 2016. Web. 21 Jan 2021.
Vancouver:
Diedesch AC. Binaural-cue weighting in sound localization with open-fit hearing aids and in simulated reverberation. [Internet] [Doctoral dissertation]. Vanderbilt University; 2016. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/1803/13402.
Council of Science Editors:
Diedesch AC. Binaural-cue weighting in sound localization with open-fit hearing aids and in simulated reverberation. [Doctoral Dissertation]. Vanderbilt University; 2016. Available from: http://hdl.handle.net/1803/13402
University of the Western Cape
4.
Paulse, Bradley.
The statistical analysis of complex sampling data
.
Degree: 2018, University of the Western Cape
URL: http://hdl.handle.net/11394/6754
► Most standard statistical techniques illustrated in text books assume that the data are collected from a simple random sample (SRS) and hence are independently and…
(more)
▼ Most standard statistical techniques illustrated in text books assume that the data are collected from a simple random sample (SRS) and hence are independently and identically distributed (i.i.d.). In reality, data are often sourced through complex sampling (CS) designs, with a combination of stratification and clustering at different levels of the design. Consequently, the CS data are not i.i.d. and sampling weights that are developed over different stages, are calculated and included in the analysis of this data to account for the sampling design. Logistic regression is often employed in the modelling of survey data since the response under investigation typically has a dichotomous outcome. Furthermore, since the logistic regression model has no homogeneity or normality assumptions, it is appealing when modelling a dichotomous response from survey data.
This research considers the comparison of the estimates of the logistic regression model parameters when the CS design is accounted for, i.e.
weighting is present, to when the data are modelled using an SRS design, i.e. no
weighting. In addition, the standard errors of the estimators will be obtained using three different variance techniques, viz. Taylor series linearization, the jackknife and the bootstrap. The different estimated standard errors will be used in the calculation of the standard (asymptotic) interval which will be compared to the bootstrap percentile interval in terms of the interval coverage probability. A further level of comparison is obtained when using only design weights to those obtained using calibrated and integrated sampling weights. This simulation study is based on the Income and Expenditure Survey (IES) of 2005/2006. The results showed that generally when
weighting was used the estimators performed better as opposed to when the design was ignored, i.e. under the assumption of SRS, with the results for the Taylor series linearization being more stable.
Advisors/Committee Members: Luus, Retha (advisor), Blignaut, Rénette (advisor).
Subjects/Keywords: Complex sampling;
Inference;
Weighting;
Survey data;
Resampling
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Paulse, B. (2018). The statistical analysis of complex sampling data
. (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/6754
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Paulse, Bradley. “The statistical analysis of complex sampling data
.” 2018. Thesis, University of the Western Cape. Accessed January 21, 2021.
http://hdl.handle.net/11394/6754.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Paulse, Bradley. “The statistical analysis of complex sampling data
.” 2018. Web. 21 Jan 2021.
Vancouver:
Paulse B. The statistical analysis of complex sampling data
. [Internet] [Thesis]. University of the Western Cape; 2018. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/11394/6754.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Paulse B. The statistical analysis of complex sampling data
. [Thesis]. University of the Western Cape; 2018. Available from: http://hdl.handle.net/11394/6754
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Tampere University
5.
Syed, Muhammad Ejazuddin.
Attribute weighting in k-nearest neighbor classification
.
Degree: 2014, Tampere University
URL: https://trepo.tuni.fi/handle/10024/96376
► Data mining is the process of getting useful information by analyzing different kind of data. Predictive data mining is used to predict some property of…
(more)
▼ Data mining is the process of getting useful information by analyzing different kind of data. Predictive data mining is used to predict some property of incoming data for example how to classify it. Among many methods that are used for predictive data mining the K-nearest neighbor classification is one of the simplest and easy to use technique. Due to its simplicity small variations are possible with it for the purpose of improving its predictive accuracy.
The aim of this thesis was to study attribute weighting techniques and to implement and test some weighting variants in K-nearest neighbor classification. The HEOM distance metric and three values of K (1, 4 and 5) were used in K-nearest neighbor classification. Twelve datasets were selected from the UCI Machine Learning Repository for the analysis. Chi-square attribute weighting was done in order to implement the two weighting variants. One variation was the simple attribute weighting and the other was the class-wise attribute weighting. The evaluation was done by using the leave-one-out technique.
The conclusion that can be drawn from the results is that the structure of the dataset (the number and the distribution of the classes) and the value of K (the number of neighbors) have effect on the unweighted and attribute weighted K-nearest neighbor classification. For some datasets weighting is very useful especially for smaller classes, but for some datasets it does not give improvements in the result.
Subjects/Keywords: K-nearest Neighbor classification;
attribute weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Syed, M. E. (2014). Attribute weighting in k-nearest neighbor classification
. (Masters Thesis). Tampere University. Retrieved from https://trepo.tuni.fi/handle/10024/96376
Chicago Manual of Style (16th Edition):
Syed, Muhammad Ejazuddin. “Attribute weighting in k-nearest neighbor classification
.” 2014. Masters Thesis, Tampere University. Accessed January 21, 2021.
https://trepo.tuni.fi/handle/10024/96376.
MLA Handbook (7th Edition):
Syed, Muhammad Ejazuddin. “Attribute weighting in k-nearest neighbor classification
.” 2014. Web. 21 Jan 2021.
Vancouver:
Syed ME. Attribute weighting in k-nearest neighbor classification
. [Internet] [Masters thesis]. Tampere University; 2014. [cited 2021 Jan 21].
Available from: https://trepo.tuni.fi/handle/10024/96376.
Council of Science Editors:
Syed ME. Attribute weighting in k-nearest neighbor classification
. [Masters Thesis]. Tampere University; 2014. Available from: https://trepo.tuni.fi/handle/10024/96376
Université Catholique de Louvain
6.
Mattelaer, Olivier.
A new approach to matrix element re-weighting.
Degree: 2011, Université Catholique de Louvain
URL: http://hdl.handle.net/2078.1/69114
► Hadron collider, like the Tevatron at Fermilab and the Large hadron Collider (LHC) at CERN require some advances analysis technique in order to measure precisely…
(more)
▼ Hadron collider, like the Tevatron at Fermilab and the Large hadron Collider (LHC) at CERN require some advances analysis technique in order to measure precisely the theoretical parameter. Recently D0 and CDF use the Matrix Element Method, method based on a matrix element re-weighting in order to achieve to measure the top-quark mass with a precision of approximatively one GeV. This re-weighting consist in the convolution of the square matrix element with a transfer functions which parameterize the answer of the detector. Recently the importance of such re-weighting rise in importance and was uses in many other analyses. This thesis presents different method in order the use the matrix element re-weighting.
In order to perform efficiently such type of re-weighting a dedicated phase-space integrators was designed (MadWeight). Indeed the numerical evaluation of such convolution requires some advances knowledge in Monte-Carlo techniques. This thesis presents how MadWeight finds an efficient way to re-weight any type of decay chain associate to arbirary transfer functions. Finally, the impact of Initial State Radiation have been studied for the first time and several stategies have been proposed in order to correct those effects.
(PHYS 3) – UCL, 2011
Advisors/Committee Members: UCL - SST/IRMP/IRMP - Institut de recherche en mathématique et physique, Maltoni, Fabio, Gérard, Jean-Marc, Lemaître, Vincent, Govaerts, Jan, D'Hondt, Jorgen, Degrassi, Giuseppe.
Subjects/Keywords: Matrix element method; Re-weighting; Likelihood
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mattelaer, O. (2011). A new approach to matrix element re-weighting. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/69114
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mattelaer, Olivier. “A new approach to matrix element re-weighting.” 2011. Thesis, Université Catholique de Louvain. Accessed January 21, 2021.
http://hdl.handle.net/2078.1/69114.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mattelaer, Olivier. “A new approach to matrix element re-weighting.” 2011. Web. 21 Jan 2021.
Vancouver:
Mattelaer O. A new approach to matrix element re-weighting. [Internet] [Thesis]. Université Catholique de Louvain; 2011. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/2078.1/69114.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mattelaer O. A new approach to matrix element re-weighting. [Thesis]. Université Catholique de Louvain; 2011. Available from: http://hdl.handle.net/2078.1/69114
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
7.
Jongbloed, Barbara (author).
Trust influences sensory weighting: Motivating an extension of the Maximum Likelihood Estimation model with a factor trust.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:7f2c9b1f-eb78-41ae-88c4-81bf2de08b1d
► There is a distinction between environmental and social interactions as humans interpret the world. Environmental interactions are based on weighted sensory estimates formed on integrated…
(more)
▼ There is a distinction between environmental and social interactions as humans interpret the world. Environmental interactions are based on weighted sensory estimates formed on integrated redundant information. Trust is a heuristic used in social interactions. As social interactions and technology interrelate, social factors become influences on the environmental estimates. Hence trust could influence our sensory estimates. The optimal sensory weights for the sensory estimates are determined with a Maximum Likelihood Estimate based on the reliability of the sensory information. The objective of this research is to find evidence that trust influences sensory
weighting on the level of sensory integration, believing that human-machine interaction will benefit from a better understanding of sensory
weighting. We hypothesised that information on the reliabilities of the sensory cues, while not changing these, will cause participants to reweigh the sensory information. Reweighing sensory information when the reliability of the sensory cue has not changed contradicts the Maximum Likelihood Estimation prediction. An experiment was conducted in which participants performed a target-hitting task with a haptic device. The target was hidden, yet participants were presented with a visual and haptic cue to deduct the location of the target. Although both cues were not of equal reliability, the participants created the optimal sensory estimate by sensory integration. The results showed that trust influenced sensory
weighting. Since the outcome of the Maximum Likelihood Estimation model was challenged by the occurrence of sensory reweighting because of trust, it is recommended to extend the model with a factor trust.
Advisors/Committee Members: Schouten, Alfred (mentor), Mugge, Winfred (mentor), Boessenkool, Henri (graduation committee), Smit, Gerwin (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Trust; Sensory Weighting; Maximum Likelihood Model
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jongbloed, B. (. (2018). Trust influences sensory weighting: Motivating an extension of the Maximum Likelihood Estimation model with a factor trust. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7f2c9b1f-eb78-41ae-88c4-81bf2de08b1d
Chicago Manual of Style (16th Edition):
Jongbloed, Barbara (author). “Trust influences sensory weighting: Motivating an extension of the Maximum Likelihood Estimation model with a factor trust.” 2018. Masters Thesis, Delft University of Technology. Accessed January 21, 2021.
http://resolver.tudelft.nl/uuid:7f2c9b1f-eb78-41ae-88c4-81bf2de08b1d.
MLA Handbook (7th Edition):
Jongbloed, Barbara (author). “Trust influences sensory weighting: Motivating an extension of the Maximum Likelihood Estimation model with a factor trust.” 2018. Web. 21 Jan 2021.
Vancouver:
Jongbloed B(. Trust influences sensory weighting: Motivating an extension of the Maximum Likelihood Estimation model with a factor trust. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 21].
Available from: http://resolver.tudelft.nl/uuid:7f2c9b1f-eb78-41ae-88c4-81bf2de08b1d.
Council of Science Editors:
Jongbloed B(. Trust influences sensory weighting: Motivating an extension of the Maximum Likelihood Estimation model with a factor trust. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:7f2c9b1f-eb78-41ae-88c4-81bf2de08b1d
University of Minnesota
8.
Verdoliva Boatman, Jeffrey.
Causal Estimators for Non-Standard Scenarios: Individual Versus Population-Level Causal Effects in Transplantation Treatment Regimes, and Clinical Trials where Compliance is Measured with Error.
Degree: PhD, Biostatistics, 2017, University of Minnesota
URL: http://hdl.handle.net/11299/190482
► Inferring and explaining causal relationships is frequently one of the primary goals in public health research. Randomized controlled trials (RCTs) are the gold standard for…
(more)
▼ Inferring and explaining causal relationships is frequently one of the primary goals in public health research. Randomized controlled trials (RCTs) are the gold standard for establishing causal effects, but often RCTs are infeasible or unethical, and we must rely on observational data for inference. Even in the case where RCTs can be conducted causal inference is often difficult due to patient noncompliance. Statistical methods for causal inference are needed in such cases. Although there exist well-established statistical causal inference methods, in this dissertation we develop methods for non-standard scenarios. In Chapter 2, we consider treatment regimes for solid organ transplantation. In Chapters 3 and 4, we consider estimating causal effects in RCTs in the presence of noncompliance. In all cases, we develop novel weighted estimators that are similar to inverse probability of compliance weighted estimators, but the weights are a ratio of probabilities rather than an inverse probability. For solid organ transplantation, these weights are needed so that our estimators have the desired interpretation, and in the case of RCTs in the presence of noncompliance, these weights are needed so that our estimators actually correspond to a causal effect of interest when traditional assumptions about noncompliance are not valid.
Subjects/Keywords: Causal Inference; Inverse Probability Weighting; Noncompliance
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Verdoliva Boatman, J. (2017). Causal Estimators for Non-Standard Scenarios: Individual Versus Population-Level Causal Effects in Transplantation Treatment Regimes, and Clinical Trials where Compliance is Measured with Error. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/190482
Chicago Manual of Style (16th Edition):
Verdoliva Boatman, Jeffrey. “Causal Estimators for Non-Standard Scenarios: Individual Versus Population-Level Causal Effects in Transplantation Treatment Regimes, and Clinical Trials where Compliance is Measured with Error.” 2017. Doctoral Dissertation, University of Minnesota. Accessed January 21, 2021.
http://hdl.handle.net/11299/190482.
MLA Handbook (7th Edition):
Verdoliva Boatman, Jeffrey. “Causal Estimators for Non-Standard Scenarios: Individual Versus Population-Level Causal Effects in Transplantation Treatment Regimes, and Clinical Trials where Compliance is Measured with Error.” 2017. Web. 21 Jan 2021.
Vancouver:
Verdoliva Boatman J. Causal Estimators for Non-Standard Scenarios: Individual Versus Population-Level Causal Effects in Transplantation Treatment Regimes, and Clinical Trials where Compliance is Measured with Error. [Internet] [Doctoral dissertation]. University of Minnesota; 2017. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/11299/190482.
Council of Science Editors:
Verdoliva Boatman J. Causal Estimators for Non-Standard Scenarios: Individual Versus Population-Level Causal Effects in Transplantation Treatment Regimes, and Clinical Trials where Compliance is Measured with Error. [Doctoral Dissertation]. University of Minnesota; 2017. Available from: http://hdl.handle.net/11299/190482
Virginia Tech
9.
Tao, Congwu.
Development of a Knowledge Assessment System Based on Concept Maps and Differential Weighting Approaches.
Degree: PhD, Curriculum and Instruction, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/56982
► This study explored the feasibility and practicability of designing and developing a Knowledge Assessment System (KAS) for assessing different types of knowledge as defined in…
(more)
▼ This study explored the feasibility and practicability of designing and developing a Knowledge Assessment System (KAS) for assessing different types of knowledge as defined in the revision of Bloom's Taxonomy (Anderson et al., 2001). The KAS created as a result of this study is based on concept maps and employs two differential
weighting approaches. It is a developmental study, which includes the design phase, development phase and evaluation phase. The general software system design model (Sommerville, 2009) was adopted to guide the design of the Knowledge Assessment System based on its procedures, including system requirements analysis, architecture design, component design, interface design, and database design. The assessment criteria in this system are designed to be proposition-based and consist of either a non-
weighting approach or a
weighting approach, which can help provide instructors with flexible assessing methods as well as help them obtain a whole picture of what kinds of knowledge their students have grasped and to what extent the students have mastered that knowledge, based on the student-created concept maps. The two differential
weighting approaches initially compare student-created concept maps with expert maps stored in the system. Because some correct propositions in student concept maps may be not included in the initial expert concept maps, the system is designed to continually refine the assessment criterion by inspecting and evaluating the correctness of the propositions in the student-created concept maps and adding the results to the system's database.
The current system is able to assess three types of knowledge: factual, conceptual, and procedural, all of which are defined in the revision of Bloom's Taxonomy (Anderson et al., 2001). The assessment process begins with the assignment of different types of concept map tasks entered and stored in the Knowledge Assessment System. Following by student completion of the tasks and submission of a concept map, the submitted concept map is compared to the criteria stored in the system and a performance report is generated.
The research results show that the Knowledge Assessment System based on concept maps and two differential
weighting approaches can act as a useful tool for assessing students' factual, conceptual and procedural knowledge based on their concept maps.
Advisors/Committee Members: Potter, Kenneth R. (committeechair), Ogle, J. Todd (committee member), Burton, John K. (committee member), Cennamo, Katherine S. (committee member).
Subjects/Keywords: knowledge assessment; educational software system; weighting approaches; non-weighting approaches; concept map
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tao, C. (2015). Development of a Knowledge Assessment System Based on Concept Maps and Differential Weighting Approaches. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/56982
Chicago Manual of Style (16th Edition):
Tao, Congwu. “Development of a Knowledge Assessment System Based on Concept Maps and Differential Weighting Approaches.” 2015. Doctoral Dissertation, Virginia Tech. Accessed January 21, 2021.
http://hdl.handle.net/10919/56982.
MLA Handbook (7th Edition):
Tao, Congwu. “Development of a Knowledge Assessment System Based on Concept Maps and Differential Weighting Approaches.” 2015. Web. 21 Jan 2021.
Vancouver:
Tao C. Development of a Knowledge Assessment System Based on Concept Maps and Differential Weighting Approaches. [Internet] [Doctoral dissertation]. Virginia Tech; 2015. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/10919/56982.
Council of Science Editors:
Tao C. Development of a Knowledge Assessment System Based on Concept Maps and Differential Weighting Approaches. [Doctoral Dissertation]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/56982
NSYSU
10.
Shih, Po-Yuan.
Skewness-Robust Neural Networks with Application to Speech Emotion Recognition.
Degree: Master, Computer Science and Engineering, 2016, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-160031
► In this paper, we propose a speech emotion recognition system on the well-known FAU-Aibo database with neural network, and compare to the results of support…
(more)
▼ In this paper, we propose a speech emotion recognition system on the well-known FAU-Aibo database with neural network, and compare to the results of support vector machine. Based on the the Classifier Sub-Challenge of INTERSPEECH 2009 Emotion Challenge, our goal is to achieve the state-of-the-art performance on the database. In FAU-Aibo, we are faced with the problem of skewed data problem, and we propose a skewness-robust method in neural network based on importance
weighting technique. To solve the problem of class-imbalanced data, we apply the cross-entropy objective function and optimize the gradient computing according to each class in back-propagation algorithm. In the feature set, we use 384 features defined by the challenge and apply histogram equalization technique to reduce the part of data variance due to speaker variation. In our experiments, we apply sampling methods commonly used in statistic to data, and compare to our proposed method. In data balancing experiments, we apply the SMOTE method and a random sub-sampling to balance data to each class and evaluate the results. However, a random sub-sampling would result in many lost data in majority class, we apply the ensemble learning method according to the idea of combination model. We get the best 45.0% result by averaging the posterior of test data in each subclassifiers for classification. We further combine the output probability of ensemble learning for feature representation learning, and success to reduce features from 384 to 40 and keep good results. For our proposed method, we use the raw imbalance data without applying any sampling method and get the best 45.8% result and 45.3% average result. This is the best result achieved by static modeling framework.
Advisors/Committee Members: Chung-hsien Wu (chair), Chia-Ping Chen (committee member), Hsin-Min Wang (chair).
Subjects/Keywords: Neural Network; Skewed Data; Histogram Equalization; Importance Weighting; Speech Emotion Recognition
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shih, P. (2016). Skewness-Robust Neural Networks with Application to Speech Emotion Recognition. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-160031
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shih, Po-Yuan. “Skewness-Robust Neural Networks with Application to Speech Emotion Recognition.” 2016. Thesis, NSYSU. Accessed January 21, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-160031.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shih, Po-Yuan. “Skewness-Robust Neural Networks with Application to Speech Emotion Recognition.” 2016. Web. 21 Jan 2021.
Vancouver:
Shih P. Skewness-Robust Neural Networks with Application to Speech Emotion Recognition. [Internet] [Thesis]. NSYSU; 2016. [cited 2021 Jan 21].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-160031.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shih P. Skewness-Robust Neural Networks with Application to Speech Emotion Recognition. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-160031
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
11.
Chou, Chan-Yi.
Portfolio Investment Based on Gene Expression Programming.
Degree: Master, Computer Science and Engineering, 2016, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118116-034927
► In this thesis, we combine the stock ranking method with the trading signals generated by Lee et al. and the portfolio redemption scheme proposed by…
(more)
▼ In this thesis, we combine the stock ranking method with the trading signals generated by Lee et al. and the portfolio redemption scheme proposed by Tsai et al. to form a stock investment method with portfolio management.
To find significant technical indicators for ranking stocks, we first calculate Pearson's product moment correlation coefficient of several technical indicators and the one-day-ahead returns. We find that the technical indicators RSI, CMO, MOM, BIAS, OSC, TAPI, and MACD are significant.
Three
weighting methods W^((1)), W^((2)) and W^((3)) are used to weight these significant indicators. To get stable weight functions, the data of every three years are divided into the
weighting interval (first year), aggregating interval (second year) and testing interval (third year). The
weighting interval is used for calculating the weights of the indicators within a group; the aggregating interval is used for calculating the aggregative weight of each group of indicators; the testing interval is used to calculate the investment return of the portfolio.
Our
weighting interval starts from 1995/1/5 and ends on 2013/12/31, and we start trading from 2002/1/4 until 2015/12/31. The average annualized return of our method is 15.79% with the weight combination (W^((1) ),W^((1) )). Furthermore, if the portfolio size and the redemption threshold are confined to 3 ⤠P ⤠10 and 40% ⤠T ⤠80%, respectively, the average annualized return is 18.52%, which is better than the annualized returns of the buy-and-hold strategy (9.26%) and Lee's method (11.05%).
Keywords: technical indicator, correlation coefficient, portfolio redemption, significant,
weighting, stock investment
Advisors/Committee Members: Chien-Feng Huang (chair), Chia-Ping Chen (chair), Ngai-Ching Wong (chair), Chang-Biau Yang (committee member), Kuo-Tsun Tseng (chair).
Subjects/Keywords: technical indicator; weighting; stock investment; portfolio redemption; significant; correlation coefficient
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chou, C. (2016). Portfolio Investment Based on Gene Expression Programming. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118116-034927
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chou, Chan-Yi. “Portfolio Investment Based on Gene Expression Programming.” 2016. Thesis, NSYSU. Accessed January 21, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118116-034927.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chou, Chan-Yi. “Portfolio Investment Based on Gene Expression Programming.” 2016. Web. 21 Jan 2021.
Vancouver:
Chou C. Portfolio Investment Based on Gene Expression Programming. [Internet] [Thesis]. NSYSU; 2016. [cited 2021 Jan 21].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118116-034927.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chou C. Portfolio Investment Based on Gene Expression Programming. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118116-034927
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universiteit Utrecht
12.
Ven, Marco van de.
Cue-weighting in native and non-native speech perception.
Degree: 2007, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/24974
► This thesis investigates cue-weighting in native and non-native speech perception. Speech perception models (i.e. the Perceptual Assimilation Model (Best, McRoberts, & Sithole, 1988; Best &…
(more)
▼ This thesis investigates cue-
weighting in native and non-native speech perception. Speech perception models (i.e. the Perceptual Assimilation Model (Best, McRoberts, & Sithole, 1988; Best & Strange, 1992; Best, 1995; Best, McRoberts, & Goodell, 2001) and the Native Language Magnet Model (Iverson & Kuhl, 1994)) predict that the degree of perceptual difficulty depends on the type of relation between the L1 and L2 phoneme inventory. In addition to these models, Broersma (2005) has shown that if native contrasts appear in non-native phonotactic contexts, non-native listeners use different cues but achieve similar accuracy levels as native listeners. By means of three separate experiments, the differences between L1 and L2 listeners were assessed in cue-
weighting when multiple cues are relevant for phoneme identification. As a follow-up on Broersma (2005) reported on in this thesis, all experiments observed the use of fricative voicing and vowel duration cues to make phoneme identifications for /v/-/f/ and /z/-/s/ continua. In Experiment 1, fricative voicing was varied along a continuum while there were two vowel durations. In Experiment 2, vowel duration was varied along a continuum, while there were three fricatives. Finally, Experiment 3 evaluated the tolerance to contrastive cues between native and non-native listeners. The experiments showed that there are significant cue-
weighting differences between native and non-native listeners, despite considerable experience in the second language.
Advisors/Committee Members: Broersma, Mirjam, Cutler, Anne, Kager, René.
Subjects/Keywords: Letteren; Cue weighting; Speech perception; Psycholinguistics; Cue trading
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ven, M. v. d. (2007). Cue-weighting in native and non-native speech perception. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/24974
Chicago Manual of Style (16th Edition):
Ven, Marco van de. “Cue-weighting in native and non-native speech perception.” 2007. Masters Thesis, Universiteit Utrecht. Accessed January 21, 2021.
http://dspace.library.uu.nl:8080/handle/1874/24974.
MLA Handbook (7th Edition):
Ven, Marco van de. “Cue-weighting in native and non-native speech perception.” 2007. Web. 21 Jan 2021.
Vancouver:
Ven Mvd. Cue-weighting in native and non-native speech perception. [Internet] [Masters thesis]. Universiteit Utrecht; 2007. [cited 2021 Jan 21].
Available from: http://dspace.library.uu.nl:8080/handle/1874/24974.
Council of Science Editors:
Ven Mvd. Cue-weighting in native and non-native speech perception. [Masters Thesis]. Universiteit Utrecht; 2007. Available from: http://dspace.library.uu.nl:8080/handle/1874/24974
Rochester Institute of Technology
13.
Lobato Ramos, Andre.
Evolutionary Weights for Random Subspace Learning.
Degree: MS, School of Mathematical Sciences (COS), 2016, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/9014
► Ensemble learning is a widely used technique in Data Mining, this method allows us to aggregate models to reduce prediction error. There are many…
(more)
▼ Ensemble learning is a widely used technique in Data Mining, this method allows us to aggregate models to reduce prediction error. There are many methods on how to perform model aggregation, one of them is known as Random Subspace Learning, which consists of building subspace of the feature space where we want to create our models. The task of selecting good subspaces and in turn produce good models for better prediction can be a daunting one, so we want to propose a new method to accomplish such a task. This proposed method allows for an automated data-driven way to attribute weights to variables in the feature space in order select variables that show themselves to be important in reducing the prediction error.
Advisors/Committee Members: Ernest Fokoue.
Subjects/Keywords: Ensemble learning; Machine learning; Random subspace learning; Weighting scheme
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lobato Ramos, A. (2016). Evolutionary Weights for Random Subspace Learning. (Masters Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/9014
Chicago Manual of Style (16th Edition):
Lobato Ramos, Andre. “Evolutionary Weights for Random Subspace Learning.” 2016. Masters Thesis, Rochester Institute of Technology. Accessed January 21, 2021.
https://scholarworks.rit.edu/theses/9014.
MLA Handbook (7th Edition):
Lobato Ramos, Andre. “Evolutionary Weights for Random Subspace Learning.” 2016. Web. 21 Jan 2021.
Vancouver:
Lobato Ramos A. Evolutionary Weights for Random Subspace Learning. [Internet] [Masters thesis]. Rochester Institute of Technology; 2016. [cited 2021 Jan 21].
Available from: https://scholarworks.rit.edu/theses/9014.
Council of Science Editors:
Lobato Ramos A. Evolutionary Weights for Random Subspace Learning. [Masters Thesis]. Rochester Institute of Technology; 2016. Available from: https://scholarworks.rit.edu/theses/9014
Vanderbilt University
14.
D'Agostino McGowan, Lucy.
Improving Modern Techniques of Causal Inference: Finite Sample Performance of ATM and ATO Doubly Robust Estimators, Variance Estimation for ATO Estimators, and Contextualized Tipping Point Sensitivity Analyses for Unmeasured Confounding.
Degree: PhD, Biostatistics, 2018, Vanderbilt University
URL: http://hdl.handle.net/1803/11174
► While estimators that incorporate both direct covariate adjustment and inverse probability weighting have drawn considerable interest, their finite sample properties have been challenged in seminal…
(more)
▼ While estimators that incorporate both direct covariate adjustment and inverse probability
weighting have drawn considerable interest, their finite sample properties have been challenged in seminal papers, such as Freedman and Berk (2008). We derive a doubly robust ATO estimator and demonstrate excellent finite sample performance for ATO and ATM doubly robust estimators in the setting of Freedman and Berk (2008). The methods and performance of variance estimators for IPW and IPW doubly robust estimators incorporating the recently defined ATO weights are an important open question in the field. We derive the large-sample variance estimator for the ATO doubly robust estimator for generalized linear models with identity, log, or logistic links. We conduct simulations to compare this estimator to common model-fitting practices, demonstrating under which conditions our estimated variance is preferred. Unobserved confounding remains a limitation for doubly robust estimators. We have worked to reframe the seminal work of Rosenbaum and Rubin (1983), Lin, Psaty, and Kronmal (1998), and Vanderweele and Ding (2017) to a formulation of a sensitivity to unmeasured confounders analysis that appeals to medical researchers. We offer guidelines to researchers for anchoring the tipping point analysis in the context of the study and introduce the R package tipr.
Advisors/Committee Members: Robert Alan Greevy, Jr. (committee member), Qingxia (Cindy) Chen (committee member), Peter Rebeiro (committee member), Frank Harrell, Jr. (Committee Chair).
Subjects/Keywords: propensity score weighting; double robust; causal inference; unmeasured confounding; sensitivity analysis
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
D'Agostino McGowan, L. (2018). Improving Modern Techniques of Causal Inference: Finite Sample Performance of ATM and ATO Doubly Robust Estimators, Variance Estimation for ATO Estimators, and Contextualized Tipping Point Sensitivity Analyses for Unmeasured Confounding. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11174
Chicago Manual of Style (16th Edition):
D'Agostino McGowan, Lucy. “Improving Modern Techniques of Causal Inference: Finite Sample Performance of ATM and ATO Doubly Robust Estimators, Variance Estimation for ATO Estimators, and Contextualized Tipping Point Sensitivity Analyses for Unmeasured Confounding.” 2018. Doctoral Dissertation, Vanderbilt University. Accessed January 21, 2021.
http://hdl.handle.net/1803/11174.
MLA Handbook (7th Edition):
D'Agostino McGowan, Lucy. “Improving Modern Techniques of Causal Inference: Finite Sample Performance of ATM and ATO Doubly Robust Estimators, Variance Estimation for ATO Estimators, and Contextualized Tipping Point Sensitivity Analyses for Unmeasured Confounding.” 2018. Web. 21 Jan 2021.
Vancouver:
D'Agostino McGowan L. Improving Modern Techniques of Causal Inference: Finite Sample Performance of ATM and ATO Doubly Robust Estimators, Variance Estimation for ATO Estimators, and Contextualized Tipping Point Sensitivity Analyses for Unmeasured Confounding. [Internet] [Doctoral dissertation]. Vanderbilt University; 2018. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/1803/11174.
Council of Science Editors:
D'Agostino McGowan L. Improving Modern Techniques of Causal Inference: Finite Sample Performance of ATM and ATO Doubly Robust Estimators, Variance Estimation for ATO Estimators, and Contextualized Tipping Point Sensitivity Analyses for Unmeasured Confounding. [Doctoral Dissertation]. Vanderbilt University; 2018. Available from: http://hdl.handle.net/1803/11174
University of Illinois – Urbana-Champaign
15.
Song, Qianqi.
Diversity shrinkage of pareto-optimal solutions in hiring practice: Simulation, shrinkage formula, and a regularization technique.
Degree: PhD, Psychology, 2018, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/101350
► To reduce adverse impact potential and improve diversity outcomes from personnel selection, one promising technique is De Corte, Lievens, and Sackett’s (2007) Pareto-optimal weighting strategy.…
(more)
▼ To reduce adverse impact potential and improve diversity outcomes from personnel selection, one promising technique is De Corte, Lievens, and Sackett’s (2007) Pareto-optimal
weighting strategy. De Corte et al.’s strategy has been demonstrated on: (a) a composite of cognitive and noncognitive (e.g., personality) tests (De Corte, Lievens, & Sackett, 2008), and (b) a composite of specific cognitive ability subtests (Wee, Newman, & Joseph, 2014). Both studies illustrated how Pareto-optimal
weighting (in contrast to unit
weighting) could lead to substantial improvement in diversity outcomes (i.e., diversity improvement), sometimes more than doubling the number of job offers for minority applicants without changing the job performance outcome in personnel selection. The current dissertation investigates topics related to a key limitation of the technique—the possibility of shrinkage, especially diversity shrinkage, in the Pareto-optimal solutions. The dissertation consists of three studies. Study 1 attempts to study diversity shrinkage and job performance validity shrinkage using Monte-Carlo simulation. Using Monte Carlo simulation, sample size and predictor combinations are varied and cross-validated Pareto-optimal solutions are obtained. Study 2 derives approximate mathematical formulae to directly correct for job performance validity shrinkage and diversity shrinkage when using Pareto-optimal weights. These shrinkage formulae for Pareto-optimal
weighting are evaluated using simulation. Finally, Study 3 attempts to develop a Pareto-optimal
weighting algorithm that achieves both optimization and regularization (similar to ridge regression, LASSO regression, or elastic nets; in the context of Pareto-optimal
weighting with two criteria). An R package is developed to estimate Pareto-optimal solutions in personnel selection (i.e., ParetoR package), which includes: (a) De Corte et al.’s (2007) Pareto-optimization method (i.e., based on the NBI algorithm; used in Study 1), (b) Pareto-optimal shrinkage formula corrections (i.e., as introduced in Study 2), and (c) a regularized Pareto-optimal method (i.e., as introduced in Study 3). In sum, the current dissertation aims to contribute to the field of diversity selection by investigating job performance validity shrinkage and diversity shrinkage under the Pareto-optimization method to simultaneously optimize both the job performance and diversity of new hires.
Advisors/Committee Members: Newman, Daniel A. (advisor), Newman, Daniel A. (Committee Chair), Rounds, James (Committee Chair), Drasgow, Fritz (committee member), Briley, Daniel (committee member), Stodden, Victoria (committee member).
Subjects/Keywords: Adverse Impact; Diversity; Personnel Selection; Pareto-Optimal Weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Song, Q. (2018). Diversity shrinkage of pareto-optimal solutions in hiring practice: Simulation, shrinkage formula, and a regularization technique. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/101350
Chicago Manual of Style (16th Edition):
Song, Qianqi. “Diversity shrinkage of pareto-optimal solutions in hiring practice: Simulation, shrinkage formula, and a regularization technique.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 21, 2021.
http://hdl.handle.net/2142/101350.
MLA Handbook (7th Edition):
Song, Qianqi. “Diversity shrinkage of pareto-optimal solutions in hiring practice: Simulation, shrinkage formula, and a regularization technique.” 2018. Web. 21 Jan 2021.
Vancouver:
Song Q. Diversity shrinkage of pareto-optimal solutions in hiring practice: Simulation, shrinkage formula, and a regularization technique. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/2142/101350.
Council of Science Editors:
Song Q. Diversity shrinkage of pareto-optimal solutions in hiring practice: Simulation, shrinkage formula, and a regularization technique. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/101350
16.
Lakshmi K.
Novel feature weighting schemes and similarity measures
for automatic text categorization;.
Degree: Novel feature weighting schemes and similarity
measures for automatic text categorization, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/30951
► For the past few years automated content based document newlinemanagement tasks have become important in information systems field due to newlinethe availability of voluminous documents…
(more)
▼ For the past few years automated content based
document newlinemanagement tasks have become important in
information systems field due to newlinethe availability of
voluminous documents in digital form Because of the large
newlinevolum information access becomes tedious Text categorization
evolved for newlinearranging the documents and to provide an easier
information access to the newlineusers Text categorization or
classification is the activity of assigning newlinethematic label
to the text documents from a predefined category labels Text
newlinecategorization is also vital in many other applications like
summarization newlinequestion answering systems document filtering
etc Thus improving the text newlineclassification in turn improves
many related applications This motivated us to newlinework in the
area of text categorization newline newline
Reference p.191-201
Advisors/Committee Members: Saswati mukherjee.
Subjects/Keywords: information and communication engineering; measures; Novel feature weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
K, L. (2014). Novel feature weighting schemes and similarity measures
for automatic text categorization;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/30951
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
K, Lakshmi. “Novel feature weighting schemes and similarity measures
for automatic text categorization;.” 2014. Thesis, Anna University. Accessed January 21, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/30951.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
K, Lakshmi. “Novel feature weighting schemes and similarity measures
for automatic text categorization;.” 2014. Web. 21 Jan 2021.
Vancouver:
K L. Novel feature weighting schemes and similarity measures
for automatic text categorization;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 21].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/30951.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
K L. Novel feature weighting schemes and similarity measures
for automatic text categorization;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/30951
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
17.
Patra, Atish Kumar.
Comparing Approaches for Weighting Applications Specific Data in Multi-Application User Interest Modeling.
Degree: MS, Computer Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153260
► This thesis presents a framework known as User Interest Modeling and Personalization (UIMAP) which builds a model by identifying and aggregating an individual user's interest…
(more)
▼ This thesis presents a framework known as User Interest Modeling and Personalization (UIMAP) which builds a model by identifying and aggregating an individual user's interest expressed through their interactions with different applications at different times. To do this, we have implemented a content consumer/producer architecture. For this thesis, Microsoft Word and PowerPoint are treated as content producer applications while a web browser is used as a content consumer application. We unobtrusively observe user interactions with these applications as well as the actual content consumed/prepared in them. The challenge is to understand the importance of each application towards the user's real interest. Based on user activity data in these applications, Multilayer Perceptron (MLP), Support Vector Machine (SVM) and Weighted K-Nearest Neighborhood (WKNN) techniques are compared in their ability to combine these kinds of heterogeneous interest indicators into a single model. Thus, each application is weighted differently based on its contributing indicators to predict the relevant content for the specific need of an individual. We found that textual content from content producer applications plays an equally important role as content from consumer applications. Implicit feedbacks from consumer applications also have a major role in user's interest. The results indicated that WKNN is preferred if feature
weighting is the primary goal while SVM is the preferred choice if identifying relevant content is the main objective.
Advisors/Committee Members: Shipman, Frank M (advisor), Caverlee, James (committee member), Reddy, A.L Narasimha (committee member).
Subjects/Keywords: User Interest Modeling; Multi-Application environment; Feature Weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Patra, A. K. (2014). Comparing Approaches for Weighting Applications Specific Data in Multi-Application User Interest Modeling. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153260
Chicago Manual of Style (16th Edition):
Patra, Atish Kumar. “Comparing Approaches for Weighting Applications Specific Data in Multi-Application User Interest Modeling.” 2014. Masters Thesis, Texas A&M University. Accessed January 21, 2021.
http://hdl.handle.net/1969.1/153260.
MLA Handbook (7th Edition):
Patra, Atish Kumar. “Comparing Approaches for Weighting Applications Specific Data in Multi-Application User Interest Modeling.” 2014. Web. 21 Jan 2021.
Vancouver:
Patra AK. Comparing Approaches for Weighting Applications Specific Data in Multi-Application User Interest Modeling. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/1969.1/153260.
Council of Science Editors:
Patra AK. Comparing Approaches for Weighting Applications Specific Data in Multi-Application User Interest Modeling. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153260
Penn State University
18.
Xu, Zhanxiong.
Efficient parameter estimation methods using quantile regression in heteroscedastic models.
Degree: 2017, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/14148zux106
► The quantile regression method, first introduced by \citet{koenker1978regression}, provides a comprehensive toolkit of performing statistical inference for a class of statistical models and has become…
(more)
▼ The quantile regression method, first introduced by \citet{koenker1978regression}, provides a comprehensive toolkit of performing statistical inference for a class of statistical models and has become an important surrogate for the conventional least squares method. Specifically, quantile regression offers several versatile approaches to produce highly efficient estimates, regardless whether the error distribution is homoscedastic or not.
This dissertation is concerned with developing some efficient estimation methods for both the regression parameter and the dispersion parameter under the parametric nonlinear heteroscedastic model. The proposed methods have their roots in quantile regression and rely heavily on large-sample properties of the estimates.
In Chapter 2, we estimate the parameters by solving the ``double-weighted composite quantile regression (DWCQR)'' optimization problem. We establish central limit theorems for both estimates, based on which we recommend an objective way of choosing the optimal weights for both the quantile losses and the heteroscedasticity. It is shown by theoretical calculation that the resulting estimates are typically more efficient than those obtained from other methods, and their asymptotic variances converge to the Cramér-Rao lower bounds as the number of quantile positions tends to infinity. An adaptive estimation procedure is reported at the end of this chapter.
The computational aspects of the DWCQR problem are discussed in Chapter 3. Although the DWCQR problem, in general, does not admit numerical solutions that are guaranteed to converge, we attempted to provide an algorithm that combines the MM algorithm (\citet{hunter2000quantile}) and the linear programming. The proposed MMLP algorithm overall works well and successfully confirms the nice theoretical properties of the DWCQR estimates using the optimal weights. The Monte Carlo study demonstrates that the DWCQR method outperforms the conventional estimation methods for the models under investigation.
In Chapter 4, for simplicity, we restrict the regression function to be linear and consider an alternative efficient estimation approach, which is based on a preliminary estimate α̂
n of the dispersion parameter. We first derive the Bahadur representation of the regression quantile β̂(τ) for fixed τ. It is then interesting to note that the effect of the α̂
n propagates in the asymptotic representation of β̂(τ). Such asymptotic bias brought by α̂
n can be eliminated by averaging regression quantiles across different quantile positions with a set of carefully chosen weights. In the meantime, it can be shown that these weights can be
simultaneously adjusted so that the resulting estimate is also asymptotically efficient. The chapter is concluded by Monte Carlo studies.
Advisors/Committee Members: Zhibiao Zhao, Dissertation Advisor/Co-Advisor, Zhibiao Zhao, Committee Chair/Co-Chair, Runze Li, Committee Member, Lingzhou Xue, Committee Member, Tao Yao, Outside Member.
Subjects/Keywords: quantile regression; heteroscedastic models; optimal weighting; composite quantile regression
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Xu, Z. (2017). Efficient parameter estimation methods using quantile regression in heteroscedastic models. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14148zux106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Xu, Zhanxiong. “Efficient parameter estimation methods using quantile regression in heteroscedastic models.” 2017. Thesis, Penn State University. Accessed January 21, 2021.
https://submit-etda.libraries.psu.edu/catalog/14148zux106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Xu, Zhanxiong. “Efficient parameter estimation methods using quantile regression in heteroscedastic models.” 2017. Web. 21 Jan 2021.
Vancouver:
Xu Z. Efficient parameter estimation methods using quantile regression in heteroscedastic models. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Jan 21].
Available from: https://submit-etda.libraries.psu.edu/catalog/14148zux106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Xu Z. Efficient parameter estimation methods using quantile regression in heteroscedastic models. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/14148zux106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
19.
Chen, Zhuo.
Cleanup of Ilmenite Water-Based Mudcake.
Degree: PhD, Petroleum Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155544
► Micronized ilmenite (FeTiO3) was reported as a weighting material in drilling fluids to avoid the disadvantages of barite and to reduce abrasion of wellbore completion.…
(more)
▼ Micronized ilmenite (FeTiO3) was reported as a
weighting material in drilling fluids to avoid the disadvantages of barite and to reduce abrasion of wellbore completion. In this dissertation, coreflood tests were applied for the first time to determine the removal efficiency of filter cake generated by water-based drilling fluids based on the micronized ilmenite under high-pressure/high-temperature (HP/HT) conditions. The capacity of different acids to dissolve the micronized ilmenite was also evaluated.
Near-wellbore conditions during the drilling fluid injection and the mudcake cleanup process in sandstone and carbonate cores at reservoir conditions were simulated by coreflood tests. Inductively coupled plasma (ICP), computerized tomography (CT) scans, and scanning electron microscopy (SEM) were used to analyze the solubility of iron and titanium, chemical composition of dried mudcake, and internal structure of the core, respectively.
A complete analysis of the particle size and chemical composition of the ilmenite sample was conducted using Coulter Counter, SEM, and X-ray diffraction (XRD). Several solubility tests were conducted under 200ºF to find an optimal solvent to dissolve the micronized ilmenite sample. The solvents include different concentrations of HCl, HEDTA, glycolic acid, formic acid, and a mixture of HCl and HEDTA. An acid solution containing 15 wt% HCl and 8 wt% HEDTA dissolved 98.4 wt% of iron and 76.5 wt% of titanium from the ilmenite sample. It was selected to remove the formation damage and to prevent the iron precipitation in the following coreflood tests.
Coreflood tests were performed under 275ºF on Berea and Bandera sandstone core, respectively. 15 wt% HCl had an excellent performance on the dissolution of iron (FeO) and calcium (CaCO3). In Bandera sandstone, 8 wt% HEDTA successfully prevented the iron precipitation. The permeabilities of Berea and Bandera sandstone have increased by 40% and 35.4% after the acid injection, respectively. Outstanding damage removal efficiency from the coreflood study proved that acid solution containing 15 wt% HCl and 8 wt% HEDTA could be served as an efficient solvent for the ilmenite-based drilling fluids.
Advisors/Committee Members: Nasr-El-Din, Hisham (advisor), Heidari, Zoya (committee member), Schubert, Jerome (committee member), El-Halwagi, Mahmoud (committee member).
Subjects/Keywords: Micronized Ilmenite; Weighting Material; Drilling Fluid; Mudcake Removal
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, Z. (2015). Cleanup of Ilmenite Water-Based Mudcake. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155544
Chicago Manual of Style (16th Edition):
Chen, Zhuo. “Cleanup of Ilmenite Water-Based Mudcake.” 2015. Doctoral Dissertation, Texas A&M University. Accessed January 21, 2021.
http://hdl.handle.net/1969.1/155544.
MLA Handbook (7th Edition):
Chen, Zhuo. “Cleanup of Ilmenite Water-Based Mudcake.” 2015. Web. 21 Jan 2021.
Vancouver:
Chen Z. Cleanup of Ilmenite Water-Based Mudcake. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/1969.1/155544.
Council of Science Editors:
Chen Z. Cleanup of Ilmenite Water-Based Mudcake. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155544
University of Saskatchewan
20.
Zawada, Daniel J 1990-.
Tomographic Retrievals of Stratospheric Ozone with the Ozone Mapping and Profiler Suite Limb Profiler.
Degree: 2018, University of Saskatchewan
URL: http://hdl.handle.net/10388/10673
► Measurements of limb scattered sunlight have been successfully used to obtain vertically resolved profiles of trace species in the stratosphere and upper troposphere for decades.…
(more)
▼ Measurements of limb scattered sunlight have been successfully used to obtain vertically resolved profiles of trace species in the stratosphere and upper troposphere for decades. A common simplifying assumption made in inverting limb scatter measurements is that the atmosphere is horizontally homogenous, which may not be valid in regions of large horizontal gradients such as on the edge of the polar vortex. Here we introduce a new radiative transfer model, SASKTRAN-HR, which can solve the radiative transfer equation in two- and three-dimensional atmospheres. A newly developed technique to approximate the Jacobian matrix for two-dimensional atmospheres is also presented.
SASKTRAN-HR is then used to perform the first tomographic retrieval of ozone from limb scattered sunlight using measurements from the Ozone Mapping and Profiler Suite (OMPS-LP). The tomographic retrieval is shown to remove biases which are present in traditional one-dimensional retrievals that assume horizontal homogeneity. The two-dimensional retrieval agrees favorably with measurements from the Microwave Limb Sounder to within approximately 5%. The retrieval was applied to the full six years of measurements from OMPS-LP to create a publicly available dataset. The dataset has been included in several merged stratospheric ozone composites which are used in the World Meteorogical Association's 2018 ozone assessment.
Advisors/Committee Members: Degenstein, Douglas, Bourassa, Adam, Smolyakov, Andrei, Shevyakov, Alexey, Xiao, Chijin, Green, Robert.
Subjects/Keywords: Radiative Transfer; SASKTRAN; Atmosphere; Stratosphere; Ozone; Retrieval; Inverse Problem; Weighting Function
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zawada, D. J. 1. (2018). Tomographic Retrievals of Stratospheric Ozone with the Ozone Mapping and Profiler Suite Limb Profiler. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/10673
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zawada, Daniel J 1990-. “Tomographic Retrievals of Stratospheric Ozone with the Ozone Mapping and Profiler Suite Limb Profiler.” 2018. Thesis, University of Saskatchewan. Accessed January 21, 2021.
http://hdl.handle.net/10388/10673.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zawada, Daniel J 1990-. “Tomographic Retrievals of Stratospheric Ozone with the Ozone Mapping and Profiler Suite Limb Profiler.” 2018. Web. 21 Jan 2021.
Vancouver:
Zawada DJ1. Tomographic Retrievals of Stratospheric Ozone with the Ozone Mapping and Profiler Suite Limb Profiler. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/10388/10673.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zawada DJ1. Tomographic Retrievals of Stratospheric Ozone with the Ozone Mapping and Profiler Suite Limb Profiler. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/10673
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
Teixeira, Joana Maria Marques Bessa.
Estudo empírico da caracterização da selecção de fornecedores.
Degree: 2010, Instituto Politécnico do Porto
URL: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2637
► O problema de selecção de fornecedores/parceiros é uma parte integrante e importante nas empresas que se propõem a um desempenho competitivo e lucrativo na sua…
(more)
▼ O problema de selecção de fornecedores/parceiros é uma parte integrante e importante nas empresas que se propõem a um desempenho competitivo e lucrativo na sua área de actividade.
A escolha do melhor fornecedor/parceiro passa na maior parte da vezes por fazer uma análise cuidada dos factores que podem influenciar positiva ou negativamente essa escolha. Desde cedo este problema tem vindo a ser alvo de inúmeros estudos, estudos esses que se focam essencialmente nos critérios a considerar e nas metodologias a adoptar para optimizar a escolha dos parceiros. De entre os vários estudos efectuados, muitos são os que consideram como critérios chave o custo do produto, a qualidade, a entrega e a reputação da empresa fornecedora. Ainda assim, há muitos outros que são referidos e que na sua maioria se apresentam como subcritérios. No âmbito deste trabalho, foram identificados cinco grandes critérios, Qualidade, Sistema Financeiro, Sinergias, Custo e Sistema Produtivo. Dentro desses critérios, sentiu-se a necessidade de incluir alguns subcritérios pelo que, cada um dos critérios chave apresenta cinco subcritérios. Identificados os critérios, foi necessário perceber de que forma são aplicados e que modelos são utilizados para se poder tirar o melhor partido das informações. Sabendo que existem modelos que privilegiam a programação matemática e outros que fazem uso de ponderações lineares para se identificar o melhor fornecedor, foi realizado um inquérito e contactadas empresas por forma a perceber quais os factores que mais peso tinham nas suas decisões de escolha de parceiros. Interpretados os resultados e tratados os dados foi adoptado um modelo de ponderação linear para traduzir a importância de cada um dos factores. O modelo proposto apresenta uma estrutura hierárquica e pode ser aplicado com o método AHP de Saaty ou o método de Análise de Valor. Este modelo permite escolher a ou as alternativas que melhor se adequam aos requisitos das empresas.
The problem of selecting suppliers/partners is an integral and important part in the companies that intend to perform competitive and profitable in their area of activity.
The choice of supplier/partner spends most of the times by making a careful analysis of the factors that can positively or negatively influence this choice. Early this problem has been the target of numerous studies, those studies that focus mainly on the criteria to be considered and methodologies to be adopted to optimize the choice of partners. Among the various studies, many are that consider that the key criteria are the product cost, quality, delivery and reputation of the supplier. Still, there are many others who are concerned and that is mostly present as a sub-criteria. In this work, there were identified five broad criteria, Quality, Financial System, Synergy, Cost and Production System. Within these criteria, it was felt the need to include some sub-criteria by which each of the key features five sub-criteria. Identified criteria, it was necessary to understand how they are applied and which models…
Advisors/Committee Members: Ávila, Paulo, Bastos, João.
Subjects/Keywords: Fornecedores/Parceiros; Selecção; Critérios; Ponderação; AHP; Suppliers/Partners; Selection; Criteria; Weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Teixeira, J. M. M. B. (2010). Estudo empírico da caracterização da selecção de fornecedores. (Thesis). Instituto Politécnico do Porto. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2637
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Teixeira, Joana Maria Marques Bessa. “Estudo empírico da caracterização da selecção de fornecedores.” 2010. Thesis, Instituto Politécnico do Porto. Accessed January 21, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2637.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Teixeira, Joana Maria Marques Bessa. “Estudo empírico da caracterização da selecção de fornecedores.” 2010. Web. 21 Jan 2021.
Vancouver:
Teixeira JMMB. Estudo empírico da caracterização da selecção de fornecedores. [Internet] [Thesis]. Instituto Politécnico do Porto; 2010. [cited 2021 Jan 21].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2637.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Teixeira JMMB. Estudo empírico da caracterização da selecção de fornecedores. [Thesis]. Instituto Politécnico do Porto; 2010. Available from: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/2637
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
A.G. Mekonnen.
MULTIDIMENSIONAL POVERTY: THEORY AND EMPIRICS.
Degree: 2015, Università degli Studi di Milano
URL: http://hdl.handle.net/2434/340448
► Paper 2: Individual Specific Weighting Scheme to a Multidimensional Poverty Measure Abstract Weights in the estimation of multidimensional poverty have a central role by showing…
(more)
▼ Paper 2: Individual Specific Weighting Scheme to a Multidimensional Poverty Measure
Abstract
Weights in the estimation of multidimensional poverty have a central role by showing the relative importance of dimensions. This paper proposed two differentweighting schemes: endowment and distributional based weighting schemes.The later weighting scheme gives more weight to the dimension with small number of deprived individuals. On the other hand, the endowment based weighting scheme gives more weight to the dimension with large number of deprived individuals. The proposed weighting schemes considerboth distributional equity and simultaneous deprivations of indicators. Using the Ethiopian rural household survey (ERHS) data for the year 2004, the paper compared the proposed weighting schemes with the equal weighting scheme approach.
The empirical result showed that, the multidimensional poverty index (MPI) estimation using endowment based equity weight has a lower estimate than the equal weighting approach. This happened because the indicators that have a small number of deprived individuals have got a higher weight under the equal weighting approach.
Paper 1: A Panel Multidimensional Poverty Estimation for Ethiopia
Abstract
Estimating the extent of poverty is a preliminary task before implementing any anti-poverty project. This can be done by creating a holistic individual deprivation index for different life dimensions. Currently, there are a growing number of multidimensional poverty index (MPI) studies. However, there exist only few empirical papers for Ethiopia that used country-specific well-being indictors in a panel data framework. This paper estimated the MPI for Ethiopia using the Ethiopian Rural Household Panel Data Survey (ERHS) for the years 2004 and 2009. The study used five dimensions and nineteen country specific well-being indicators to estimate MPI.
The MPI estimation with the counting approach showed that the percentage of multidimensional poor people for the years 2004 and 2009 were 35% and 25% respectively. The paper decomposed MPI across regions, household sizes, and depth and breadth of poverty. The MPI decomposition across time estimate confirmed that the large decrease in the MPI was the result of a significant decrease in the number of poor households among the middle and the large families than a decrease in the number of deprivations. The panel MPI decomposition also showed that, once a household slipped into poverty, the probability of exiting from it was very low. Child mortality contributed more for the decrease in the breadth of poverty. Moreover, the decrease in asset deprivation contributed the largest for the decrease in MPI across the two periods. The use of country-specific indicators such as land holding and crop stored for agrarian economy are more likely to identify poor people than indicators used in internationally comparable MPI estimation. This panel based MPI estimation clearly showed the progress or regresses of the household in achieving a particular…
Advisors/Committee Members: coordinatore: P. Garella, supervisor: R. Miniaci, K. Decancq, GARELLA, PAOLO.
Subjects/Keywords: Ethiopian Rural Household Survey; Multidimensional Poverty Index; Counting Approach; Panel MPI decomposition estimation; Endowment and distributional based weighting schemes; equal weighting scheme; Domains; Observed preference weighting; equal weighting approach; perceived deprivations; Settore SECS-P/06 - Economia Applicata
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mekonnen, A. (2015). MULTIDIMENSIONAL POVERTY: THEORY AND EMPIRICS. (Thesis). Università degli Studi di Milano. Retrieved from http://hdl.handle.net/2434/340448
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mekonnen, A.G.. “MULTIDIMENSIONAL POVERTY: THEORY AND EMPIRICS.” 2015. Thesis, Università degli Studi di Milano. Accessed January 21, 2021.
http://hdl.handle.net/2434/340448.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mekonnen, A.G.. “MULTIDIMENSIONAL POVERTY: THEORY AND EMPIRICS.” 2015. Web. 21 Jan 2021.
Vancouver:
Mekonnen A. MULTIDIMENSIONAL POVERTY: THEORY AND EMPIRICS. [Internet] [Thesis]. Università degli Studi di Milano; 2015. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/2434/340448.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mekonnen A. MULTIDIMENSIONAL POVERTY: THEORY AND EMPIRICS. [Thesis]. Università degli Studi di Milano; 2015. Available from: http://hdl.handle.net/2434/340448
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
23.
Wilson, Daniel Joseph.
The Dynamics of Decision Making: Attribute Evaluation and Weighting.
Degree: 2017, University of Toronto
URL: http://hdl.handle.net/1807/79446
► The aim of the present research was to investigate the evaluation and weighting mechanisms people employ in multi-attribute decision making. In a Primary and Supplementary…
(more)
▼ The aim of the present research was to investigate the evaluation and weighting mechanisms people employ in multi-attribute decision making. In a Primary and Supplementary Study, I developed a choice task that required subjects to assess the summed value of two attributes and, based on this value, make an accept or reject decision. The Primary Study employed a novel experimental paradigm which allowed us to dynamically track subject attention, with stimulus values that could be dynamically reweighted via the addition of â multipliersâ , which magnified attribute values on a trial-by-trial basis. I found that people were able to accurately re-weight attribute when making decisions. Results also revealed that people tend to fixate longer on stimuli that have been re-weighted. Finally, I developed a computational model of the task using drift diffusion modeling, which provides the basis for future imaging studies to extend this work in a search for neural correlates of attribute evaluation and weighting.
M.A.
Advisors/Committee Members: Hutcherson, Cendri A, Psychology.
Subjects/Keywords: Cognitive Neuroscience; Computational modeling; Decision making; Multi-attribute; Neuroeconomics; Weighting; 0633
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wilson, D. J. (2017). The Dynamics of Decision Making: Attribute Evaluation and Weighting. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/79446
Chicago Manual of Style (16th Edition):
Wilson, Daniel Joseph. “The Dynamics of Decision Making: Attribute Evaluation and Weighting.” 2017. Masters Thesis, University of Toronto. Accessed January 21, 2021.
http://hdl.handle.net/1807/79446.
MLA Handbook (7th Edition):
Wilson, Daniel Joseph. “The Dynamics of Decision Making: Attribute Evaluation and Weighting.” 2017. Web. 21 Jan 2021.
Vancouver:
Wilson DJ. The Dynamics of Decision Making: Attribute Evaluation and Weighting. [Internet] [Masters thesis]. University of Toronto; 2017. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/1807/79446.
Council of Science Editors:
Wilson DJ. The Dynamics of Decision Making: Attribute Evaluation and Weighting. [Masters Thesis]. University of Toronto; 2017. Available from: http://hdl.handle.net/1807/79446
Missouri University of Science and Technology
24.
Lolur, Phalgun.
Construction of multi-state potential energy surfaces for spectroscopy and dynamics.
Degree: PhD, Chemistry, Missouri University of Science and Technology
URL: https://scholarsmine.mst.edu/doctoral_dissertations/2484
► "This dissertation is about construction and visualization of multi-state Born-Oppenheimer potential energy surfaces which are essential for studying spectroscopy and dynamics. A potential energy…
(more)
▼ "This dissertation is about construction and visualization of multi-state Born-Oppenheimer potential energy surfaces which are essential for studying spectroscopy and dynamics. A potential energy surface is a mathematical function that represents the energy of a system as a function of its molecular geometry. The Born-Oppenheimer approximation enables us to solve the Schrödinger equation by separating the nuclear and electronic motions. Construction of potential energy surfaces has become a basic and crucial operation for chemists in order to compute various electronic states of molecules for understanding the spectroscopy, kinetics and dynamics of molecules. These methods have been used to successfully (i) predict transitions, spectroscopic constants and band origins for magnesium carbide (MgC) and (ii) calculate global spin-orbit surfaces in order to assign levels in the mono-halocarbenes, CH(D)X (X=Cl, Br, I). 3D plastic models of the potential energy surfaces were also generated using additive manufacturing (3D printing) for understanding the reactivity and stable structures of molecules" – Abstract, page iv.
Subjects/Keywords: 3D printing; Dynamic weighting; Chemistry
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lolur, P. (n.d.). Construction of multi-state potential energy surfaces for spectroscopy and dynamics. (Doctoral Dissertation). Missouri University of Science and Technology. Retrieved from https://scholarsmine.mst.edu/doctoral_dissertations/2484
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Chicago Manual of Style (16th Edition):
Lolur, Phalgun. “Construction of multi-state potential energy surfaces for spectroscopy and dynamics.” Doctoral Dissertation, Missouri University of Science and Technology. Accessed January 21, 2021.
https://scholarsmine.mst.edu/doctoral_dissertations/2484.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
MLA Handbook (7th Edition):
Lolur, Phalgun. “Construction of multi-state potential energy surfaces for spectroscopy and dynamics.” Web. 21 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Lolur P. Construction of multi-state potential energy surfaces for spectroscopy and dynamics. [Internet] [Doctoral dissertation]. Missouri University of Science and Technology; [cited 2021 Jan 21].
Available from: https://scholarsmine.mst.edu/doctoral_dissertations/2484.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Council of Science Editors:
Lolur P. Construction of multi-state potential energy surfaces for spectroscopy and dynamics. [Doctoral Dissertation]. Missouri University of Science and Technology; Available from: https://scholarsmine.mst.edu/doctoral_dissertations/2484
Note: this citation may be lacking information needed for this citation format:
No year of publication.
University of Minnesota
25.
Muller, Clemma.
Stroke disparities and selection bias in an American Indian cohort: the Strong Heart and Strong Heart Stroke Studies.
Degree: PhD, Epidemiology, 2015, University of Minnesota
URL: http://hdl.handle.net/11299/194569
► Abstract Background. American Indians experience higher stroke morbidity and mortality compared to US general population, but are underrepresented in public health research. Data on incident…
(more)
▼ Abstract Background. American Indians experience higher stroke morbidity and mortality compared to US general population, but are underrepresented in public health research. Data on incident stroke in American Indians derive mainly from the Strong Heart Study (SHS), a population-based cohort study of cardiovascular disease in 4549 American Indians who were 45-74 years old when baseline exams were conducted from 1988-1990. The SHS had higher stroke rates than reported for Whites and African Americans in external comparisons to other cohorts. These findings suggested similar disparities in covert vascular brain injury (VBI), an often asymptomatic form of cerebrovascular disease that precedes clinical events. Accordingly, from 2010-2013 the Strong Heart Stroke Study (SHSS) used structural cranial magnetic resonance imaging to assess covert VBI in 1033 surviving members of the SHS. Goals. In this dissertation we addressed three limitations to using SHS and SHSS data for analysis of stroke and covert VBI in American Indians: Manuscript 1) lack of research that directly compares stroke incidence and mortality in American Indians vs. other racial groups, and which limits current knowledge to external comparisons that do not account for differences in stroke risk factors; Manuscript 2) potential selection bias in SHSS data when survival and participation of cohort members depends on both the exposures and outcomes of interest; and Manuscript 3) an inherent limitation in effect measures estimates that condition on categories defined by progressively older age or longer time since exposure, and which leads to observed point estimates that are potentially biased estimates of the true effects. Manuscript 1. Methods: We pooled data from the SHS and the Atherosclerosis Risk in Communities Study (ARIC) to compare stroke risk and post-stroke mortality in American Indians vs. Blacks and Whites. We used Cox regression to estimate hazard ratios (HR) with attained age as the time scale to account for differences in baseline age at enrollment, and adjusted estimates for baseline factors that included prevalent hypertension and diabetes. Due to effect modification, analyses were stratified by birth year tertile (1914-1930, 1931-1937, and 1938-1947). We used logistic regression to compare 30-day and 1-year post-stroke mortality among participants from both studies who experienced stroke during follow-up. Results: Stroke risk among American Indians in the SHS was lower than among Blacks for all birth year tertiles (1914-1930: HR = 0.9 (95% CI = 0.7, 1.1); 1931-1937: HR = 0.9 (95% CI = 0.7, 1.2); 1938-1947: HR = 0.9 (95% CI = 0.7, 1.2)), but higher than among Whites (1914-1930: HR = 1.6 (95% CI = 1.3, 2.0); 1931-1937: HR = 2.2 (95% CI = 1.7, 2.8); 1938-1947: HR = 2.7 (95% CI = 2.0, 3.6)) in ARIC. Adjusting for risk factors including prevalent diabetes at baseline resulted in strengthening of associations compared to Blacks (oldest to youngest tertile HR = 0.8 (95% CI = 0.6-1.0); 0.7 (95% CI = 0.5-1.0); and 0.6 (95% CI = 0.4-0.8)), and…
Subjects/Keywords: American Indians; Bounds; Inverse Probability Weighting; Selection bias; Stroke
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Muller, C. (2015). Stroke disparities and selection bias in an American Indian cohort: the Strong Heart and Strong Heart Stroke Studies. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/194569
Chicago Manual of Style (16th Edition):
Muller, Clemma. “Stroke disparities and selection bias in an American Indian cohort: the Strong Heart and Strong Heart Stroke Studies.” 2015. Doctoral Dissertation, University of Minnesota. Accessed January 21, 2021.
http://hdl.handle.net/11299/194569.
MLA Handbook (7th Edition):
Muller, Clemma. “Stroke disparities and selection bias in an American Indian cohort: the Strong Heart and Strong Heart Stroke Studies.” 2015. Web. 21 Jan 2021.
Vancouver:
Muller C. Stroke disparities and selection bias in an American Indian cohort: the Strong Heart and Strong Heart Stroke Studies. [Internet] [Doctoral dissertation]. University of Minnesota; 2015. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/11299/194569.
Council of Science Editors:
Muller C. Stroke disparities and selection bias in an American Indian cohort: the Strong Heart and Strong Heart Stroke Studies. [Doctoral Dissertation]. University of Minnesota; 2015. Available from: http://hdl.handle.net/11299/194569
University of Ontario Institute of Technology
26.
Hacatoglu, Kevork.
A systems approach to assessing the sustainability of hybrid community energy systems.
Degree: 2014, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/472
► The goal to achieve a sustainable society that will endure over the long term is generally regarded as a positive evolutionary course. One of the…
(more)
▼ The goal to achieve a sustainable society that will endure over the long term is
generally regarded as a positive evolutionary course. One of the challenges with this
goal is developing a quantitative assessment of the sustainability of a system. Despite
the different measures available in the literature, a standard and universally accepted
index for assessing sustainability does not yet exist. This thesis develops a novel
Integrated Sustainability Index (ISI) for energy systems that considers critical
multidimensional sustainability criteria. The originality of this new index is that it
incorporates fundamental thermodynamic, economic, and environmental constraints to
combine indicators from multiple dimensions into a single-score evaluation of
sustainability. The index is therefore unique because it can assess sustainability relative
to an ideal reference state instead of being limited to ranking systems via relative
assessments.
The ISI of an energy system is determined by normalization,
weighting, and
aggregation of sustainability indicators. Indicators are normalized relative to sustainable
threshold values and weighted based on time, space, and receptor (i.e., human or
ecosystem impacts) criteria. Aggregation yields an ISI between zero and one, where one
represents a sustainable system. The ISI is calculated for several different case studies
spanning a range of fossil- and renewable-based energy systems. Each is designed as a
stand-alone system to meet the energy needs of a small community in Southern
Ontario. The analysis shows that of the various alternatives, a solar-photovoltaichydrogen
system has the best ISI, which ranges from 0.65-0.90 and is a 4-25%
improvement over the reference, gas-fired system. For the solar-photovoltaic-hydrogen
system and many others, climate change and ozone layer depletion indicators have the
strongest effect on ISI. Affordability, commercial viability, and land area indicators are
also critical for other energy systems. The ISI is expected to prove useful as a high-level,
multi-criteria decision analysis tool for understanding and fostering sustainable energy
systems, alone or in concert with other approaches.
Advisors/Committee Members: Dincer, Ibrahim, Rosen, Marc.
Subjects/Keywords: Energy system; Index; Life-cycle assessment; Sustainability; Weighting factor
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hacatoglu, K. (2014). A systems approach to assessing the sustainability of hybrid community energy systems. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/472
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hacatoglu, Kevork. “A systems approach to assessing the sustainability of hybrid community energy systems.” 2014. Thesis, University of Ontario Institute of Technology. Accessed January 21, 2021.
http://hdl.handle.net/10155/472.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hacatoglu, Kevork. “A systems approach to assessing the sustainability of hybrid community energy systems.” 2014. Web. 21 Jan 2021.
Vancouver:
Hacatoglu K. A systems approach to assessing the sustainability of hybrid community energy systems. [Internet] [Thesis]. University of Ontario Institute of Technology; 2014. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/10155/472.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hacatoglu K. A systems approach to assessing the sustainability of hybrid community energy systems. [Thesis]. University of Ontario Institute of Technology; 2014. Available from: http://hdl.handle.net/10155/472
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Southern California
27.
Liu, Jiajuan.
Mode of visual perceptual learning: augmented Hebbian
learning explains the function of feedback and beyond.
Degree: PhD, Neuroscience, 2011, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/630039/rec/4111
► This thesis concerns the augmented Hebbian reweighting model (AHRM) in perceptual learning. The development of AHRM was inspired by two sets of research endeavors: first,…
(more)
▼ This thesis concerns the augmented Hebbian reweighting
model (AHRM) in perceptual learning. The development of AHRM was
inspired by two sets of research endeavors: first, converging
researches in perceptual learning suggest that subjects’
performance may be improved through specific channel reweighting
between representation areas and decision units in visual system
(Dosher & Lu, 1998; 1999); second, the complex pattern of
empirical results concerning the role of feedback in perceptual
learning rules out both a purely supervised mode and a purely
unsupervised mode of learning, and leads some researchers to
suggest that feedback may change the learning rate through top-down
control instead of acting as a teacher signal (Herzog & Fahle,
1998). Constructed by Petrov, Dosher and Lu (Petrov, Dosher &
Lu, 2005), the AHRM utilizes feedback to influence the effective
rate of learning by serving as an additional input instead of a
direct teacher signal. In this thesis, we discuss two predictions
of the AHRM: one regarding the interactions between feedback and
levels of training accuracy, and the other concerning the
facilitatory effect from trials of high training accuracy to low
ones. Training in a Gabor orientation identification task over six
days, subjects were divided into groups of different feedback
conditions and levels of training accuracy (or mixtures of
different levels of training accuracy). In the tasks with a single
training accuracy level, contrast thresholds improved in the
condition of high training accuracy independent of feedback
conditions, but thresholds improved in the condition of low
training accuracy only in the presence of feedback. In the tasks
with levels of low and high training accuracy mixed, however, even
without feedback, contrast thresholds in the low training accuracy
level still improved roughly the same amount as those in high
training accuracy levels and/or with feedback. The results are both
qualitatively and quantitatively consistent with the predictions of
the AHRM, but inconsistent with purely supervised error correction
models or purely unsupervised Hebbian learning models. ❧ The AHRM
was also applied in modelling the perceptual learning in external
noise and helped us to understand several interesting observations:
(1) perceptual learning improved contrast thresholds at all levels
of external noise in peripheral orientation identification (Dosher
& Lu, 1998, 1999), (2) training with low external noise
improved performance in high external noise, while training with
high external noise did not affect performance in low external
noise (Dosher & Lu, 2005), and (3) pre-training with high
external noise only reduced subsequent learning in high external
noise, whereas pre-training with zero external noise practically
eliminated any or left very little additional learning in all the
external noise conditions (Lu, Chu & Dosher, 2006). ❧ The
behavioral confirmation of the predictions from the AHRM, together
with its ability to interpret a range of experimental results in
perceptual learning,…
Advisors/Committee Members: Lu, Zhong-lin (Committee Chair), Tjan, Bosco S. (Committee Member), Hirsch, Judith A. (Committee Member), Grzywacz, Norberto M. (Committee Member), Baker, Robert L. (Committee Member).
Subjects/Keywords: perceptual learning; augmented Hebbian re-weighting; feedback; psychophysics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, J. (2011). Mode of visual perceptual learning: augmented Hebbian
learning explains the function of feedback and beyond. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/630039/rec/4111
Chicago Manual of Style (16th Edition):
Liu, Jiajuan. “Mode of visual perceptual learning: augmented Hebbian
learning explains the function of feedback and beyond.” 2011. Doctoral Dissertation, University of Southern California. Accessed January 21, 2021.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/630039/rec/4111.
MLA Handbook (7th Edition):
Liu, Jiajuan. “Mode of visual perceptual learning: augmented Hebbian
learning explains the function of feedback and beyond.” 2011. Web. 21 Jan 2021.
Vancouver:
Liu J. Mode of visual perceptual learning: augmented Hebbian
learning explains the function of feedback and beyond. [Internet] [Doctoral dissertation]. University of Southern California; 2011. [cited 2021 Jan 21].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/630039/rec/4111.
Council of Science Editors:
Liu J. Mode of visual perceptual learning: augmented Hebbian
learning explains the function of feedback and beyond. [Doctoral Dissertation]. University of Southern California; 2011. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/630039/rec/4111
Louisiana State University
28.
Wang, Xuan.
A Comparison of Causal Inference Methods and Their Application in Big Data Analytics.
Degree: DBA, Business Analytics, 2018, Louisiana State University
URL: https://digitalcommons.lsu.edu/gradschool_dissertations/4613
► With the rise of Big Data analytics, the new field of causal inference (Pearl, 2009) has received more attention in business research fields such…
(more)
▼ With the rise of Big Data analytics, the new field of causal inference (Pearl, 2009) has received more attention in business research fields such as Accounting (Lawrence, Minutti-Meza, & Zhang, 2011) and Marketing (Manganaris, Bhasin, Reid, & Hermiz Keith, 2010). Traditional statistics focuses on correlation which may lead to misleading conclusions because the estimates can be severely biased even when data sets are large. The objective of causal inference is to obtain estimates from observational data that are unbiased and can thus be interpreted as causal. This study provides a systematic comparison of the performance of four causal inference methods which are Propensity Score Matching, Standardization, Inverse Probability Weighting and Orthogonal Arrays. The risk difference, risk ratio and odds ratio are compared for these estimators. This research uses bootstrapping with different sample sizes to ensure that reliable estimates for bias and mean squared error are obtained. Topics relevant to method selection and recommendations for use of the methods are offered.
Additionally, with applying the suggestions and recommendations derived from the simulation, two examples are used to demonstrate how causal inference improves estimates. The first example explores the use of causative analytics for improving retention and graduation rates using a series of causal inference methods with semester-based information about student performance. The findings reveal that the effect of living on campus and math preparation for improving student retention rates and graduation rates is considerably lower than traditional estimates showed. The second example investigates the relationship and effect size between the implementation of the UberX service and fatalities due to drunk driving among different age groups. The findings disclose that while traditional methods show that there is a statistically significant effect of UberX deployment on the number of DWI fatalities among youth ages 17-34 and older ages 35-65, the causal estimates are no longer statistically significant.
Subjects/Keywords: Causal Inference; Propensity Score Matching; Standardization; Inverse Probability Weighting; Orthogonal Arrays
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wang, X. (2018). A Comparison of Causal Inference Methods and Their Application in Big Data Analytics. (Doctoral Dissertation). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_dissertations/4613
Chicago Manual of Style (16th Edition):
Wang, Xuan. “A Comparison of Causal Inference Methods and Their Application in Big Data Analytics.” 2018. Doctoral Dissertation, Louisiana State University. Accessed January 21, 2021.
https://digitalcommons.lsu.edu/gradschool_dissertations/4613.
MLA Handbook (7th Edition):
Wang, Xuan. “A Comparison of Causal Inference Methods and Their Application in Big Data Analytics.” 2018. Web. 21 Jan 2021.
Vancouver:
Wang X. A Comparison of Causal Inference Methods and Their Application in Big Data Analytics. [Internet] [Doctoral dissertation]. Louisiana State University; 2018. [cited 2021 Jan 21].
Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4613.
Council of Science Editors:
Wang X. A Comparison of Causal Inference Methods and Their Application in Big Data Analytics. [Doctoral Dissertation]. Louisiana State University; 2018. Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4613
University of Maryland
29.
Han, Daifeng.
INVESTIGATION OF ALTERNATIVE CALIBRATION ESTIMATORS IN THE PRESENCE OF NONRESPONSE.
Degree: Survey Methodology, 2017, University of Maryland
URL: http://hdl.handle.net/1903/19939
► Calibration weighting is widely used to decrease variance, reduce nonresponse bias, and improve the face validity of survey estimates. In the purely sampling context, Deville…
(more)
▼ Calibration
weighting is widely used to decrease variance, reduce nonresponse bias, and improve the face validity of survey estimates. In the purely sampling context, Deville and Särndal (1992) demonstrate that many alternative forms of calibration
weighting are asymptotically equivalent, so for variance estimation purposes, the generalized regression (GREG) estimator can be used to approximate some general calibration estimators with no closed-form solutions such as raking. It is unclear whether this conclusion holds when nonresponse exists and single-step calibration
weighting is used to reduce nonresponse bias (i.e., calibration is applied to the basic sampling weights directly without a separate nonresponse adjustment step).
In this dissertation, we first examine whether alternative calibration estimators may perform differently in the presence of nonresponse. More specifically, properties of three widely used calibration estimations, the GREG with only main effect covariates (GREG_Main), poststratification, and raking, are evaluated. In practice, the choice between poststratification and raking are often based on sample sizes and availability of external data. Also, the raking variance is often approximated by a linear substitute containing residuals from a GREG_Main model. Our theoretical development and simulation work demonstrate that with nonresponse, poststratification, GREG_Main, and raking may perform differently and survey practitioners should examine both the outcome model and the response pattern when choosing between these estimators. Then we propose a distance measure that can be estimated for raking or GREG_Main from a given sample. Our analytical work shows that the distance measure follows a Chi-square probability distribution when raking or GREG_Main is unbiased. A large distance measure is a warning sign of potential bias and poor confidence interval coverage for some variables in a survey due to omitting a significant interaction term in the calibration process. Finally, we examine several alternative variance estimators for raking with nonresponse. Our simulation results show that when raking is model-biased, none of the linearization variance estimators under evaluation is unbiased. In contrast, the jackknife replication method performs well in variance estimation, although the confidence interval may still be centered in the wrong place if the point estimate is inaccurate.
Advisors/Committee Members: Valliant, Richard (advisor).
Subjects/Keywords: Statistics; calibration; GREG; nonresponse adjustment; raking; variance estimation; weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Han, D. (2017). INVESTIGATION OF ALTERNATIVE CALIBRATION ESTIMATORS IN THE PRESENCE OF NONRESPONSE. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/19939
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Han, Daifeng. “INVESTIGATION OF ALTERNATIVE CALIBRATION ESTIMATORS IN THE PRESENCE OF NONRESPONSE.” 2017. Thesis, University of Maryland. Accessed January 21, 2021.
http://hdl.handle.net/1903/19939.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Han, Daifeng. “INVESTIGATION OF ALTERNATIVE CALIBRATION ESTIMATORS IN THE PRESENCE OF NONRESPONSE.” 2017. Web. 21 Jan 2021.
Vancouver:
Han D. INVESTIGATION OF ALTERNATIVE CALIBRATION ESTIMATORS IN THE PRESENCE OF NONRESPONSE. [Internet] [Thesis]. University of Maryland; 2017. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/1903/19939.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Han D. INVESTIGATION OF ALTERNATIVE CALIBRATION ESTIMATORS IN THE PRESENCE OF NONRESPONSE. [Thesis]. University of Maryland; 2017. Available from: http://hdl.handle.net/1903/19939
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Maryland
30.
Lewis, Taylor Hudson.
Testing for Phase Capacity in Surveys with Multiple Waves of Nonrespondent Follow-Up.
Degree: Survey Methodology, 2014, University of Maryland
URL: http://hdl.handle.net/1903/16262
► To mitigate the potentially harmful effects of nonresponse, many surveys repeatedly follow up with nonrespondents, often targeting a particular response rate or predetermined number of…
(more)
▼ To mitigate the potentially harmful effects of nonresponse, many surveys repeatedly follow up with nonrespondents, often targeting a particular response rate or predetermined number of completes. Each additional recruitment attempt generally brings in a new wave of data, but returns gradually diminish over the course of a fixed data collection protocol. This is because each subsequent wave tends to contain fewer and fewer new responses, thereby resulting in smaller and smaller changes on (nonresponse-adjusted) point estimates. Consequently, these estimates begin to stabilize. This is the notion of phase capacity, suggesting some form of design change is in order, such as switching modes, increasing the incentive, or, as is considered exclusively in this research, discontinuing the nonrespondent follow-up campaign altogether. This dissertation consists of three methodological studies proposing and assessing various techniques survey practitioners can use to formally test for phase capacity. One of the earliest known phase capacity testing methods proposed in the literature calls for multiply imputing nonrespondents' missing data to assess, retrospectively, whether the most recent wave of data significantly altered a key estimate. The first study introduces an adaptation of this test amenable to surveys that instead reweight the observed data to compensate for nonresponse. A general limitation of methods discussed in the first study is that they are applicable to a single point estimate. The second study evaluates two extensions, each with the aim of producing a universal, yes-or-no phase capacity determination for a battery of point estimates. The third study builds upon ideas of a prospective phase capacity test recently proposed in the literature attempting to address the question of whether an imminent wave of data will significantly alter a key estimate. All three studies include a simulation study and application using data from the 2011 Federal Employee Viewpoint Survey.
Advisors/Committee Members: Lahiri, Partha (advisor), Kreuter, Frauke (advisor).
Subjects/Keywords: Statistics; Social research; Federal Employee Viewpoint Survey; imputation; nonresponse; weighting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lewis, T. H. (2014). Testing for Phase Capacity in Surveys with Multiple Waves of Nonrespondent Follow-Up. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/16262
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lewis, Taylor Hudson. “Testing for Phase Capacity in Surveys with Multiple Waves of Nonrespondent Follow-Up.” 2014. Thesis, University of Maryland. Accessed January 21, 2021.
http://hdl.handle.net/1903/16262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lewis, Taylor Hudson. “Testing for Phase Capacity in Surveys with Multiple Waves of Nonrespondent Follow-Up.” 2014. Web. 21 Jan 2021.
Vancouver:
Lewis TH. Testing for Phase Capacity in Surveys with Multiple Waves of Nonrespondent Follow-Up. [Internet] [Thesis]. University of Maryland; 2014. [cited 2021 Jan 21].
Available from: http://hdl.handle.net/1903/16262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lewis TH. Testing for Phase Capacity in Surveys with Multiple Waves of Nonrespondent Follow-Up. [Thesis]. University of Maryland; 2014. Available from: http://hdl.handle.net/1903/16262
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [11] ▶
. 
Open Access Theses and Dissertations
