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Determination of the Optimal Number of Strata for Bias Reduction in Propensity Score Matching.

Description: Previous research implementing stratification on the propensity score has generally relied on using five strata, based on prior theoretical groundwork and minimal empirical evidence as to the suitability of quintiles to adequately reduce bias in all cases and across all sample sizes. This study investigates bias reduction across varying number of strata and sample sizes via a large-scale simulation to determine the adequacy of quintiles for bias reduction under all conditions. Sample sizes rang… more
Date: May 2010
Creator: Akers, Allen
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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A Simulation Study Comparing Various Confidence Intervals for the Mean of Voucher Populations in Accounting

Description: This research examined the performance of three parametric methods for confidence intervals: the classical, the Bonferroni, and the bootstrap-t method, as applied to estimating the mean of voucher populations in accounting. Usually auditing populations do not follow standard models. The population for accounting audits generally is a nonstandard mixture distribution in which the audit data set contains a large number of zero values and a comparatively small number of nonzero errors. This study … more
Date: December 1992
Creator: Lee, Ihn Shik
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Attenuation of the Squared Canonical Correlation Coefficient Under Varying Estimates of Score Reliability

Description: Research pertaining to the distortion of the squared canonical correlation coefficient has traditionally been limited to the effects of sampling error and associated correction formulas. The purpose of this study was to compare the degree of attenuation of the squared canonical correlation coefficient under varying conditions of score reliability. Monte Carlo simulation methodology was used to fulfill the purpose of this study. Initially, data populations with various manipulated conditions wer… more
Date: August 2010
Creator: Wilson, Celia M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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An Empirical Investigation of Tukey's Honestly Significant Difference Test with Variance Heterogeneity and Equal Sample Sizes, Utilizing Box's Coefficient of Variance Variation

Description: This study sought to determine boundary conditions for robustness of the Tukey HSD statistic when the assumptions of homogeneity of variance were violated. Box's coefficient of variance variation, C^2 , was utilized to index the degree of variance heterogeneity. A Monte Carlo computer simulation technique was employed to generate data under controlled violation of the homogeneity of variance assumption. For each sample size and number of treatment groups condition, an analysis of variance F-tes… more
Date: May 1980
Creator: Strozeski, Michael W.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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An Empirical Investigation of Tukey's Honestly Significant Difference Test with Variance Heterogeneity and Unequal Sample Sizes, Utilizing Kramer's Procedure and the Harmonic Mean

Description: This study sought to determine the effect upon Tukey's Honestly Significant Difference (HSD) statistic of concurrently violating the assumptions of homogeneity of variance and equal sample sizes. Two forms for the unequal sample size problem were investigated. Kramer's form and the harmonic mean approach were the two unequal sample size procedures studied. The study employed a Monte Carlo simulation procedure which varied sample sizes with a heterogeneity of variance condition. Four thousand ex… more
Date: May 1976
Creator: McKinney, William Lane
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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The Applications of Regression Analysis in Auditing and Computer Systems

Description: This thesis describes regression analysis and shows how it can be used in account auditing and in computer system performance analysis. The study first introduces regression analysis techniques and statistics. Then, the use of regression analysis in auditing to detect "out of line" accounts and to determine audit sample size is discussed. These applications led to the concept of using regression analysis to predict job completion times in a computer system. The feasibility of this application o… more
Date: May 1977
Creator: Hubbard, Larry D.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Robustness of the One-Sample Kolmogorov Test to Sampling from a Finite Discrete Population

Description: One of the most useful and best known goodness of fit test is the Kolmogorov one-sample test. The assumptions for the Kolmogorov (one-sample test) test are: 1. A random sample; 2. A continuous random variable; 3. F(x) is a completely specified hypothesized cumulative distribution function. The Kolmogorov one-sample test has a wide range of applications. Knowing the effect fromusing the test when an assumption is not met is of practical importance. The purpose of this research is to analyze the … more
Date: December 1996
Creator: Tucker, Joanne M. (Joanne Morris)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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The Fixed v. Variable Sampling Interval Shewhart X-Bar Control Chart in the Presence of Positively Autocorrelated Data

Description: This study uses simulation to examine differences between fixed sampling interval (FSI) and variable sampling interval (VSI) Shewhart X-bar control charts for processes that produce positively autocorrelated data. The influence of sample size (1 and 5), autocorrelation parameter, shift in process mean, and length of time between samples is investigated by comparing average time (ATS) and average number of samples (ANSS) to produce an out of control signal for FSI and VSI Shewhart X-bar charts. … more
Date: May 1993
Creator: Harvey, Martha M. (Martha Mattern)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Sampling Plan for Incoming Material Inspection at Sanden

Description: Sanden international, an automobile air conditioning compressor manufacturer, was facing a problem in its incoming material inspection procedures. Although the company had designed and was using its own sampling plan, some managers and supervisors where not confident of its reliability. Sanden recently established a goal for its total number of defects per supplier as one part per million. Achievement of this target required reviews of the existing sampling plan. The purpose of this project was… more
Date: December 1995
Creator: Puntel, Luis
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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A Comparison of Observation Systems for Monitoring Engagement in an Intervention Program

Description: The measurement of engagement, or the interaction of a person with their environment, is an integral part of assessing the quality of an intervention program for young children diagnosed with autism spectrum disorder. Researchers and practitioners can and do measure engagement in many ways on the individual and group level. The purpose of this methodological study was to compare three commonly used recording systems: individual partial interval, group momentary time sampling, and group partial … more
Date: May 2018
Creator: Linden, April D.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Development of a Machine Transcription Work Sample Test for Secretarial Selection

Description: The study described the development of a standardized, normed, content-valid machine transcription test which could be used to evaluate the ability of secretarial applicants to type a mailable copy of a business letter from a dictated tape recording. The test was based on a thorough job analysis and was pretested using a pilot study with job incumbents to confirm its feasibility. Normative data were developed from 50 job applicants. Interrater reliability was statistically significant (r = .85,… more
Date: August 1981
Creator: Kaye, Deborah Frances
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Live Sampling in Improvised Musical Performance: Three Approaches and a Discussion of Aesthetics

Description: Three original software programs utilizing improvisation and live sampling are presented here, along with a discussion of aesthetic issues raised by each. They are entitled Zur Elektrodynamik bewegter Musiker, Motet, and Gamepad Sampler. These programs vary in the degree of required interaction and in the kind of user control. They are each studies in imitative counterpoint through live sampling, with an approach seeking elegance before solutions. Because of the improvisational nature of these … more
Date: August 2007
Creator: Morris, Jeffrey Martin
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Boosting for Learning From Imbalanced, Multiclass Data Sets

Description: In many real-world applications, it is common to have uneven number of examples among multiple classes. The data imbalance, however, usually complicates the learning process, especially for the minority classes, and results in deteriorated performance. Boosting methods were proposed to handle the imbalance problem. These methods need elongated training time and require diversity among the classifiers of the ensemble to achieve improved performance. Additionally, extending the boosting method to… more
Date: December 2013
Creator: Abouelenien, Mohamed
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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An Exploration of the Word2vec Algorithm: Creating a Vector Representation of a Language Vocabulary that Encodes Meaning and Usage Patterns in the Vector Space Structure

Description: This thesis is an exloration and exposition of a highly efficient shallow neural network algorithm called word2vec, which was developed by T. Mikolov et al. in order to create vector representations of a language vocabulary such that information about the meaning and usage of the vocabulary words is encoded in the vector space structure. Chapter 1 introduces natural language processing, vector representations of language vocabularies, and the word2vec algorithm. Chapter 2 reviews the basic math… more
Date: May 2016
Creator: Le, Thu Anh
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Implementation of Compressive Sampling for Wireless Sensor Network Applications

Description: One of the challenges of utilizing higher frequencies in the RF spectrum, for any number of applications, is the hardware constraints of analog-to-digital converters (ADCs). Since mid-20th century, we have accepted the Nyquist-Shannon Sampling Theorem in that we need to sample a signal at twice the max frequency component in order to reconstruct it. Compressive Sampling (CS) offers a possible solution of sampling sub-Nyquist and reconstructing using convex programming techniques. There has been… more
Date: May 2018
Creator: Ruprecht, Nathan Alexander
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Random Sampling

Description: The purpose of this study is to show the use of random sampling in solving certain mathematical problems. The origin of random numbers to be used in sampling is discussed and methods of sampling from known distributions are then given together with an indication that the sampling procedures are unbiased.
Date: January 1957
Creator: Booker, Aaron Hicks
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Conducting Tick-Borne Disease Research in Texas with a Focus on Rickettsia spp.

Description: The field of vector-borne disease research uses multidisciplinary approaches to help understand complicated interactions. This dissertation, covers three different aspects of tick-borne disease research which all focus on exploring tick-borne diseases in the non-endemic areas of Denton, County Texas and the state of Texas with a focus on Rickettsia spp. These aspects include tick sampling, testing ticks for the presence of Rickettsia spp., and creating species distribution maps of the Rickettsi… more
Date: May 2020
Creator: Huddleston, Jody Sue
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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A New Era of Educational Assessment: the Use of Stratified Random Sampling in High Stakes Testing

Description: Although sampling techniques have been used effectively in education research and practice it is not clear how stratified random sampling techniques apply to high-stakes testing in the current educational environment. The present study focused on representative sampling as a possible means for reducing the quantity of state-administered tests in Texas public education. The purpose of this study was two-fold: (1) to determine if stratified random sampling is a viable option for reducing the numb… more
Date: December 2013
Creator: Brown, Stephanie N.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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