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 20 of 41 for “"Linear Mixed-Effects Model"”.
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Mister Parid's Neighborhood: Dispersal Behavior and Flocking Dynamics of the Social Black-crested Titmouse (Baeolophus atricristatus)
… (Baeolophus bicolor), the BCTI is an ideal model species for studying family-flocking dynamics. The three goals of my project were to: (1) determine whether intrinsic factors, such as weight or sex, or extrinsic factors, such as territory size or habitat composition, affect the natal …
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Statistical Inference and Community Detection in Proximity and Spatial Proteomics: Resolving the Organization of the Neuronal Proteome
… designs. I present a flexible, linear mixed-effects model framework for assessing differential abundance in protein mass spectrometry experiments. Combined with methods to identify communities of proteins in biological networks, I extend this framework to perform inference at the …
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Empathy as a Predicting Factor of Stress Contagion Susceptibility
… used to index physiological stress responses. A linear mixed-effects model revealed a significant three-way interaction between time, condition, and empathy. Specifically, individuals high in trait empathy exhibited greater changes in physiological stress response from pre to post stimulus. This …
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Analysis of the relationship between foreign shareholding and ESG performance of South African listed companies
… In analysing the data through a generalised linear mixed effects model, this study identified a positive and significant association between the overall ESG, environmental, and social scores and the percentage of foreign shareholding, respectively. Stakeholder theory suggests that companies …
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Hierarchical Variation in Cellulose Decomposition Across Southern Ontario Reference Streams
… and seasonal differences were studied using a linear mixed effects model (LMEM). A partial least squares (PLS) regression analysis was performed to identify environmental variables associated with decomposition patterns. I found that variance associated with each successive spatial scale was …
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Transcranial Direct Current Stimulation of the Dorsolateral Prefrontal Cortex Does Not Improve Handgrip Time-to-Failure or Alter Central or Peripheral Hemodynamics
… muscle hemodynamics (all <em>p </em>> 0.05). A linear mixed-effects model revealed no significant main effect of condition on recovery MVC (<em>p </em>> 0.05). This study provides evidence tDCS does not improve HGTTF in older adults, adding contrastingevidence regarding the effects of an acute …
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Capturing Latent Abilities and Latent Capacities of Professional Golfers Using Nonlinear Mixed Effects Growth Modeling
… capacities of professional golfers. I used nonlinear mixed effects growth modeling (e.g., Dynamic Measurement Modeling) to measure professional golfers’ ability levels and capacities for improvement. I accomplished this using a two-stage modeling approach. First, a crossed linear mixed effects …
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The Effect of an Acute Bout of Rock Climbing on Cognitive Functioning and Cortisol Levels
… levels were assessed by the Stroop test. A linear mixed-effects model was used to examine the differences between cognition and cortisol before and after the interventions in control and climbing groups. Reaction times and salivary cortisol levels were significantly lower after the …
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Ecological Factors Influencing Infection Rates of the Birch Polypore Inonotus obliquus in the Laurentian Mixed Forest Province
… at tree level by constructing a generalized linear mixed-effects model to predict host infection status, estimate infection rates in a variety of forest types and compare statistical methods for doing so, and examine basic morphological characteristics of conks. The study area included forest …
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Efficacy of Curodont in Managing Incipient Caries in Primary Teeth
… to a depth of 225 µm. Using R software, a linear mixed-effects model was used to evaluate the effects of the different treatments (α=0.05). Results: SDF-treated specimens demonstrated the highest microhardness values from 25–100 µm. Microhardness values were similar among all groups from …
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Racing patterns of elite and non-elite male Two Oceans marathon runners
… mean race pace of each finisher. A Generalised Linear Mixed Effects Model (GLMM) analysis was used to examine the patterns of average pace change between groups. Results: A reduction in average pace was observed across all groups for the first three segments, with an increase in average pace for …
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Exploring circadian blood pressure patterns
… in ABPM and incorporate the data together in one model, different random-effects models were explored which allowed us to obtain estimates of both within and between-individual variation of model parameters. A piece-wise linear mixed-effects model was considered as a simple but suitable approach …
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Choosing Between the Fixed-, Random-, and Mixed-Effects Model in Meta-Analysis: An Analysis of Existing and New Model Selection Methods
The purpose of this thesis is to examine various model selection methods in the context of meta-analysis. Four different models are commonly thought to describe the structure underlying a collection of effect size estimates, namely the fixed-effects, the fixed-effects with moderators, the …
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Sample size determination for Emax model, equivalence / non-inferiority test and drug combination in fixed dose trials.
… economic and human resources, but also improve model performance and efficiency. We first explore the sample sizes of Emax model for a simple one group crossover design. Emax model is the one of the most frequently used models defining the relationship of drug efficacy with respect to its dosing …
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ASSESSING THE GENOTOXICITY OF TRICLOSAN IN TADPOLES OF THE AMERICAN BULLFROG, LITHOBATES CATESBEIANUS.
… of 15 micronuclei per 2,000 erythrocytes scored. Modeling of MN induction dynamics by treatment suggested that the best predictor of micronucleus induction was the acute TCS exposure level, as described by a linear mixed effects model including a binomial term of time exposed. Micronucleus …
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Are Highways Stressful for Pikas?: Analysis of Stress Hormones of the American Pika (<i>Ochotona princeps</i>) Living Adjacent to Interstate 90 in the Cascade Range of Washington State
… elevation, and longitude) and noise levels. A linear mixed-effects model was used to test for differences in fGCM concentrations among habitats and assess the potential effects of these environmental variables on stress. Pikas in the highway habitat had the lowest fGCM levels among the 3 …
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Alzheimer's disease: Age of Onset Modifier Genes in the World’s Largest Pedigree
… association analysis using the multi-locus linear mixed-effects model and collapsing methods to identify common and rare ADAOO modifiers, respectively. Using data mining and predictive modelling tools, a clinical diagnostic tool with potential applications in the clinical setting is …
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Alzheimer's disease: Age of Onset Modifier Genes in the World’s Largest Pedigree
… association analysis using the multi-locus linear mixed-effects model and collapsing methods to identify common and rare ADAOO modifiers, respectively. Using data mining and predictive modelling tools, a clinical diagnostic tool with potential applications in the clinical setting is …
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Analysis of gender wage gap using mixed effects models
… gap for each job title using a novel approach: linear mixed effects regression. The linear mixed effects model captures both systematic trends and unexplained variability simultaneously to provide a more comprehensive understanding of the gender wage gap. Here are the key findings: 1. The …
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Validity Evidence for Construct-Aligned Entrustment Assessments in Vascular Surgery
… conducted on matched encounter assessments. A linear mixed-effects model was conducted to examine factors associated with the alignment. Intraclass correlation was calculated between trainee and faculty assessments. A random effects model was applied to all assessments to demonstrate sources of …
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