Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Beta regression."”.
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Bayesian approach for modeling zero-inflated plant percent covers using spatial left-censored beta regression
… to build models for percent cover data is to use beta distribution, utilizing left-censoring to create probability mass for zero observations. In this study, alternative versions of left-censored beta regression are implemented and their behavior studied when applied to real data from the Baltic …
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Essays on Model Selection Uncertainty and Model Averaging: Computational and Empirical Work with Beta Regression, Multiple Linear Regression with ARMA Innovations, and the Minimum Description Length Principle
… of model selection uncertainty. In Chapter 2, regression models based on the beta distribution were investigated from the standpoint of multi-model uncertainty and model averaging. A tool that can combine model selection uncertainty and beta regression modeling was developed. It combined …
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Covariate-adjusted ROC regressions and the extensions in trend tests.
… the ROC using parametric and semi-parametric regression methods. The latest addition to this ongoing investigation into problems of this type made use of the beta regression for placement values and the property that their CDF is the ROC curve. The underlying motivation for the dissertation is …
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Parametric quantile regression models for continuous proportions data : an evaluation of mean versus median modeling beyond beta
… data. Traditional models, such as the beta regression model, although widely adopted, lack robustness against outliers, thus motivating the need for alternative models capable of addressing these limitations. This dissertation provides a comprehensive evaluation of various parametric …
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Inequality and Violence: The Case of Brazil
… homicides. The research findings, derived from a beta regression analysis, postulate a direct correlation between the prevalence of violence and markers of socioeconomic inequality, such as the Gini index, illiteracy rates, infant mortality, Municipal Human Development Index (HDI), and poverty …
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Microbiome and Metagenomics: Statistical Methods, Computation and Applications
… factors. We develop a zero-inflated Beta regression model with random effects for testing the association between microbial abundance and clinical covariates for longitudinal microbiome data. The model includes a logistic regression component to model presence/absence of a microbe in …
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Assessing the effect on the mode of class attendance on academic performance in a postgraduate financial accounting IV class at a private higher education institution in South Africa
… A quantitative analysis was performed using the beta regression analysis and the Kruskal-Wallis test. Additionally, machine learning in the form of the random forest algorithm technique was employed to alleviate the limiting effect of the small sample size. The class modes investigated were …
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Statistical Adequacy and Reliability of Inference in Regression-like Models
… we are able to derive the properties of Beta regression-like models, appropriate when the researcher deals with rates and proportions or any other random variable with finite support; and of Lognormal models, appropriate when the researcher deals with nonnegative data, and specially …
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Novel Applications of Statistical and Machine Learning Methods to Analyze Trial-Level Data from Cognitive Measures
… Finally, multiple Bayesian logistic based regression models (including a cumulative logit model, logistic regression model, and zero-one-inflated beta regression model) are applied to the metamemory task described previously to demonstrate the benefits of performing item-level analyses …
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Measuring the Effect of Firm-Level Investor Sentiment on Liquidity and Financial Distress
Using pooled regressions, I evaluated the effect of firm-level investor sentiment derived from news and Twitter content on a firm’s share liquidity. The results indicate several key findings. (1) Improvements (deteriorations) in news sentiment lead to an increase (decrease) in share liquidity; …
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Bayesian regional models of gold and copper alloys from pre-Hispanic Colombia
… approaches (multilevel, Gaussian Process, and beta regression modelling) that simultaneously account for sampling uncertainties and interdependencies; allow for the explicit modelling of spatial autocorrelation; and accommodate for the compositional nature of analytical data. It is argued that …
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Bat Boxes as Mitigation Tools: Factors Impacting Microclimate and Myotis sodalis Roost Selection
… and abundance. We used linear models and beta regression to test the effects of design, solar treatment, weather, and bat abundance on roost microclimate. Indiana bats showed no preference for roost design, but preferred roosting in easterly and westerly sun roost clusters, which provide …
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Policy Diffusion in U.S. Hazard Mitigation Planning: An Intergovernmental Perspective
… initial analysis, this research further uses the Beta Regression model to examine the textual similarities within LHMPs in Ohio, focusing on how the type of author - government versus private consultants, and the nature of the goals, whether action-based or hazard-based, affect these alignments. …
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Preparing urban mobility for the future of work: impacts and adaptation
… new models, which leverage zero-one inflated beta regression and mobile phone records to predict individual commuting patterns, are then applied to the City of Chicago to estimate the impact of remote work on carbon emissions from commuting. The study finds that overall carbon emissions are …