Search results
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Title
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Analysis of failure time data with missing and informative auxiliary covariates.
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Author
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Ghosh, Lipika
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Date Created
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2011
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Subjects--Topical
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Statistics, Mathematics, Biometry
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Description
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In this dissertation we use Cox's regression model to failure time data with continuous informative auxiliary variables in the presence of a validation subsample. The work is motivated by a common problem of missing or mismeasured covariates in su...
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Title
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Best probability density function for random sampled data
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Author
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Jacobs, Donald J.
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Date Created
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2009
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Subjects--Topical
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Statistics, Probabilities
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Description
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The maximum entropy method is a theoretically sound approach to construct an analytical form for the probability density function (pdf) given a sample of random events. In practice, numerical methods employed to determine the appropriate Lagrange ...
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Title
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Beyond the PCA : a comprehensive review of dimension reduction techniques
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Author
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Kenjale, Tanmay
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Date Created
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2022
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Subjects--Topical
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Statistics, Dimension reduction (Statistics), Regression analysis
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Description
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Regression analysis is a key tool in modeling the relationship between predictor variables and the conditional mean of the response variable. However, as the number of predictors increases, existing estimation methods become challenging. Dimension...
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Title
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CUSTOMER ATTRITION MODELING AND FORECASTING
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Author
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Xu, Zehan
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Date Created
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2019
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Subjects--Topical
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Statistics
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Description
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Customer relationship management has shown its critical role in the success of a company in today’s increasingly competitive service industry. While modern machine learning techniques are widely adopted due to their advantages in working with exte...
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Title
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Changes in Lysozyme flexibility upon mutation are frequent, large and long-ranged
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Author
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Jacobs, Donald J., Verma, Deeptak, Livesay, Dennis R.
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Date Created
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2012
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Subjects--Topical
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Bioinformatics, Statistics
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Description
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We investigate changes in human c-type lysozyme flexibility upon mutation via a Distance Constraint Model, which gives a statistical mechanical treatment of network rigidity. Specifically, two dynamical metrics are tracked. Changes in flexibility ...
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Title
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Clean Power Plan, Dirty Politics: An Examination of State Reactions to Climate Regulation
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Author
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Withrow, Matthew
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Date Created
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2017
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Subjects--Topical
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Statistics, Power resources
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Description
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While carbon emissions are widely believed to be contributing to climate change, the U.S. has done little to limit the massive amounts of carbon being introduced into the atmosphere by electricity producing power plants. The Clean Power Plan (CPP)...
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Title
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Combatting Ceiling Effects: Modeling High-Ability Student Growth Using Multilevel Tobit Regression
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Author
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Hujar, Julia
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Date Created
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2022
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Subjects--Topical
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Educational tests and measurements, Gifted children--Education, Statistics
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Description
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Pressures associated with accountability testing have resulted in a narrowing of both the curriculum and pedagogy that does not meet the needs of high ability learners. This study proposed that either a different measurement (an above-level comput...
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Title
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Cross-Sectional and Time Series Analysis of Crime Rate Across North Carolina
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Author
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Johnson, Isabella
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Date Created
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2022
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Subjects--Topical
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Statistics, Mathematics
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Description
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Unemployment rate reached an astronomical high in 2020 due to the Covid-19 pandemic.The media began reporting on increasing crime rates due to the unemployment rate rising. The Center for Disease Control (CDC) reported that over 81,000 drug overdo...
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Title
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Dynamic Modeling of Incomplete Event History Data
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Author
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Heng, Fei
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Date Created
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2019
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Subjects--Topical
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Statistics
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Description
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Event history analysis has important applications in many fields, such as medicine, engineering, econometrics, actuarial science, and social studies. We usually encounter missing data problems in the modeling of event history data. One typical pro...
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Title
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Evolution and dynamics of transcriptional regulation in bacteria
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Author
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Li, Shan
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Date Created
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2013
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Subjects--Topical
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Computer science, Statistics, Bioinformatics
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Description
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Although transcription is one of the most important biological functions of cells, our understanding of its regulation is still limited. In this dissertation, we have studied the transcriptional regulation in prokaryotes in three aspects. First, w...
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Title
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Generalized semiparametric varying-coefficient models for longitudinal data
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Author
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Qi, Li
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Date Created
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2015
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Subjects--Topical
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Mathematics, Statistics, Biometry
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Description
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In this dissertation, we investigate the generalized semiparametric varying-coefficient models for longitudinal data that can flexibly model three types of covariate effects: time-constant effects, time-varying effects, and covariate-varying effec...
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Title
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Goodness-of-Fit Tests Under Permutations
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Author
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Chen, Chen
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Date Created
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2019
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Subjects--Topical
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Statistics, Mathematics, Information science
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Description
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Several new goodness-of-fit tests are proposed on countable alphabets, where certain fundamental statistical concepts associated with random variables, such as cumulative distribution functions, characteristic functions and moments, may not exist....
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Title
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Greater Than the Sum of Its Parts: Isomorphism in Measures of Team Constructs
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Author
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Clayton, Elizabeth
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Date Created
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2022
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Subjects--Topical
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Statistics, Organizational behavior
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Description
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Work teams are an ever-growing structure as organizations seek to become more agile and achieve better outcomes (Bersin, 2016; Deloitte, 2018). Therefore, organizational researchers seek to accurately recognize and understand various aspects of te...