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 419 for “"effect sizes"”.
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An exploration of mutation effect sizes in the nematode Caenorhabditis elegans
… whether the mutation rate or average mutation effect size differed between the two strains. I predicted that the mev-1 nematodes would have a higher overall estimated mutation rate due to their high oxidative stress. Since mutation rate and mutation effect size are inversely related, I …
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BLINDED EVALUATIONS OF EFFECT SIZES IN CLINICAL TRIALS: COMPARISONS BETWEEN BAYESIAN AND EM ANALYSES
… that allow a blinded estimation of the treatment effect, using knowledge of trial operational characteristics, have been suggested in the literature. Clinical trials are designed to evaluate effects of one or more treatments on multiple primary and secondary endpoints. The multiplicity issues when …
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Comparisons of Improvement-Over-Chance Effect Sizes for Two Groups Under Variance Heterogeneity and Prior Probabilities
… properties of improvement-over-chance, I, effect sizes derived from linear and quadratic predictive discriminant analysis (PDA) and from logistic regression analysis (LRA) for the two-group univariate classification were examined. Data were generated under varying levels of four data …
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Effect Sizes for Single Case Experimental Designs and Their Utility for a Meta-Analysis: A Simulation Study
… has been a lack of consensus as to the optimal effect size for use in meta-analyses involving Single Case Experimental Designs (SCEDs). SCEDs are a set of experimental designs which produce data akin to short interrupted time-series, where observations may not be independent due to …
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Power approximation for the test of study-level categorical moderators in meta-regression with dependent effect sizes
… have been established for fixed- and random-effects models for independent effects, there is currently no methodology for conducting power analysis for moderator tests in meta-regression models that account for dependence. Building on a previous study that evaluated power approximations for …
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Rational Effect Size Measurement
We often want to achieve our goals as effectively as possible. But what are the most effective interventions to achieve our goals? Here, we often turn to science for advice. And, scientists across various fields – from social science to medicine – measure how effective tested interventions are, …
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A Meta-Analysis of Selected Studies on the Effectiveness of Bilingual Education
… towards school or self. The magnitude of Effect Sizes was influenced by types of programs compared, language of the criterion instruments, academic domain of the criterion instruments, random vs. non-random assignment of students to programs, formula used to calculate Effect Sizes and …
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The use of joint mobilization on mechanical instability deficits for a lateral ankle sprain: A Systematic Review
… using the PEDro Scale and a comparison of effect sizes. Each study was read without the use of the PEDro Scale and then again with the use of the PEDro Scale. Scores were then compared between investigators. If differences in scores occurred, it was discussed until an agreement of final …
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Anabolic-androgenic steroids : a series of meta-analyses
… the psychological, physiological, and ergogenic effects of anabolic-androgenic steroids (AAS)s in healthy humans. Using the format of a meta-analysis, data from 127 studies and 35 outcomes was converted into 894 effect sizes and summarized across studies. In order to account for any significant …
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An Analysis of the Effects That Several Design Variables Have on the Accuracy and Precision of Glass’ Delta and Hedges’ g
<p>Effect size is the standardized effect that some treatment has on a sample of a population. In particular, Hedges' <em>g </em>and Glass delta are mean difference effect size estimators that are used to compute the effect sizes found in an experimental situation. A confidence interval is an …
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A meta-analysis of the relation of trauma and somatization: an investigation of methodological factors related to effect size
… present study intended to estimate an overall effect size for the relation of trauma and somatization, to empirically describe the methods used to study the relation of trauma and somatization, and to determine if methodological differences between studies contribute to differences in estimates …
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Attrition in Longitudinal Studies Using Older Adults: A Meta-Analysis
… in longitudinal research by estimating the mean effect sizes for participant loss across 57 studies published in 13 prestigious journals which regularly use older participants. Results estimate overall attrition to be around 34% of the original sample. The subsequent break down of attrition into …
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A meta-analysis of the effects of social support on adaptation in Roy's four modes
… methods were utilized in order to determine the effects of social support in the nursing studies. Twenty-one subject-studies comprised the sample for the study. Health outcomes were categorized into the four adaptive modes identified by Roy. The investigator developed coding instruments were used …
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Exploring The Effectiveness Of Telehealth Adolescents' Interventions On Sleep: A Meta-Analysis
… purpose of this meta-analysis was to explore the effectiveness of any telehealth interventions that report sleep outcomes on adolescents, ages 11-20 years old. It was hypothesized that most studies will favor telehealth treatment, regardless of type of treatment, and will present medium to high …
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Can ideas activate behavior? A meta-analysis of the effects of a variety of conceptual priming objects and strategies on behavioral outcomes
… meta-analysis sought to estimate its mean effect size and to quantify publication bias as well as the effects of moderators like goal expectancy (ease), filler tasks, goal value, and the directness of the association between prime and outcome. We estimated a mean of d = 0.4220 across 682 …
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A Meta-Analysis of Attention Deficit/Hyperactivity Disorder Interventions: An Empirical Road to Pragmatic Solutions
… of behavior intervention and medication, effected the functioning of students diagnosed with ADHD under the DSM III or DSM IV definition. Effect sizes were calculated for each qualified, independent sample. Effect sizes were calculated for combinations of the 9 outcome variables with each …
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Effectiveness of Flipped Classroom Instruction in Secondary Education
… studies in this thesis aimed at examining the effectiveness of flipped classroom instruction in secondary education by conducting a meta-analytic synthesis of prior studies and an intervention study with a methodologically new approach. Specifically, the studies investigated whether and under …
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A meta-analytic review of the relation between impulsivity-related traits and family history of alcoholism
… of this association. Sixty-nine independent effect sizes from 65 studies (N = 11,127) qualified for the meta-analysis. The overall effect size was small-to-moderate (d = .32 [95% CI: 0.25, 0.39], k = 69), and was moderated by offspring age (Z = 3.73, p < .001), with the effect size increasing …
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A meta-analysis comparing alternative methods of individualized and traditional instruction in science
… educational researchers have investigated the effectiveness of alternative methods of instruction in science. These investigations have resulted in the publication of numerous studies which frequently report contradictory findings. The purpose of this study was to synthesize the studies …
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