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.
Results
Showing 1 to 20 of 224 for “"Statistical Power"”.
-
Simulating Statistical Power Curves with the Bootstrap and Robust Estimation
Power and effect size analysis are important methods in the psychological sciences. It is well known that classical statistical tests are not robust with respect to power and type II error. However, relatively little attention has been paid in the psychological literature to the effect that …
-
Using Interactive Diagrams to Teach Graduate Students About Statistical Power
… designed to teach graduate students about the statistical concept of power. It contains a literature review of techniques used to teach statistics, similar computer-based programs for representing the concept of power, and instructional theories that pertain to web-based tutorials. It describes …
-
Statistical power for RNA-seq data to detect two epigenetic phenomena
… are discussed in this dissertation. RNA-seq is a powerful new technology for mapping and quantifying transcriptomes using ultra high throughput next generation sequencing technologies. Using RNA-seq, a genome-wide study can investigate genome-wide genomic imprinting and AEI without prior knowledge …
-
The Impact of Sample Size, Prevalence, Estimation Method and Other Factors When Estimating Multilevel Logistic Models
… influential factors impacting mean estimates of statistical power, confidence interval coverage and width, and likelihood of non-positive definite G-matrices, other key features of multilevel models including the level of random intercept and slope variance and estimation method also impact …
-
Mixture Model Approaches to Integrative Analysis of Multi-Omics Data and Spatially Correlated Genomic Data
<p>Integrative genomic data analysis is a powerful tool to study the complex biological processes behind a disease. Statistical methods can model the interrelationships of the involved gene activities through jointly analyzing multiple types of genomic data from different platforms (vertical …
-
Y chromosome and allozyme correlates of geotaxis in selected lines of Drosophila melanogaster and their hybrids
… chromosome substitution experiment a small, but statistically significant Y chromosome effect on geotaxis was detected. The increase in statistical power with the chromosome substitution experiment, relative to the backcrosses, was due to decreasing the genetic ""noise"" and increasing sample …
-
Improvement of Release Criteria for Immediate Release Solid Oral Dosage Forms
… presented the results of an investigation the statistical power of USP compendial release tests and recommended alternatives.</p><p> The U.S. drug supply chain, formerly protected by a closed distribution network, is now threatened by the legal and illegal importation of drug products. Whereas …
-
Detecting Rater Centrality Effect Using Simulation Methods and Rasch Measurement Analysis
… inaccurate), in terms of Type I error rate and statistical power, each centrality-detection index is in flagging effect raters; and (3) how the features of the data collection design (i.e., the independent variables including the level of centrality strength, the double-scoring rate, and the …
-
Effect of Unequal Sample Sizes on the Power of DIF Detection: An IRT-Based Monte Carlo Study with SIBTEST and Mantel-Haenszel Procedures
… the effect of unequal sample sizes on statistical power of SIBTEST and Mantel-Haenszel procedures for detection of DIF of moderate and large magnitudes. Item parameters were estimated by, and generated with the 2PLM using WinGen2 (Han, 2006). MULTISIM was used to simulate ability …
-
A type I error investigation of modified Scheffe-based multiple-comparison procedures in factorial ANOVA, MANOVA, and multiple-regression situations
… familywise Type I error rates while increasing statistical power are encouraged to consider these improved multiple-comparison methods.
-
Monitoring amphibian populations and the status of wood frogs and boreal chorus frogs in the Kawuneeche Valley of Rocky Mountain National Park
… in wood frog egg masses and evaluated the statistical power of using counts of egg masses and linear regression to detect trends. In Chapter 1, I used closed capture-recapture models to estimate detection probability and evaluate potential sources of variation in the detectability of wood …
-
Spatial and Temporal Influences of Water Quality on Zooplankton in Lake Texoma
… to seasonal, physical and chemical factors. Statistical power, sample size and taxonomic resolution were examined. When monitoring seasonal and annuals trends in abundance, the greatest statistical power was achieved by analyzing count data at taxonomic levels above genus. Taxonomic …
-
Testing Measurement Invariance in Multilevel Data with Unequal Cross-Level Factor Structures
… simulation studies were designed to evaluate the statistical power and Type I error rates of the two estimation approaches. The manipulated conditions included the factor structure, between-level factor variance, number of clusters, cluster size, size of noninvariance, and location of …
-
Baited remote underwater video survey of reef fish in the Stilbaai marine protected area, with an assessment of monitoring requirements
… inter-observer variability and increasing statistical power. Species richness and relative abundance were assessed employing BRUV technology in the Stilbaai MPA in the Western Cape, South Africa. ... [The] result corroborated findings from traditional underwater visual census (UVC) and …
-
Private Random Variate Sampling for Secure and Federated Polygenic Risk Scores
… data centers are important for improving the statistical power and validity of PRS through larger, more genetically diverse datasets. However, owing to the privacy concerns inherent in genomic data, regulations restrict institutions’ capacity to share data. Using cryptography, we present a …
-
The Production and Evaluation of Evidence in Experimental Economics
… of dictator game experiments. Using his data and statistical models, we determine his results to be robust with one important exception. In Engel's report, the effects of the take-option on giving are statistically insignificant. By contrast, we find the negative effects to be economically and …
-
Assessment and optimisation of MRI measures of atrophy as potential markers of disease progression in multiple sclerosis
… and precision, which provided greater statistical power. Direct comparison of numerous techniques demonstrated significant differences between them. Atrophy measurements from SIENA and the BBSI (registration-based techniques) were significantly more precise than segmentation and …
-
The Potential Effects of Exercise-Induced Cortisol Release on Executive Functioning in Preadolescents
… to changes in salivary cortisol due to a lack of statistical power. This study could provide insight into the physiological effects of increased cortisol release on cognition, specifically in regard to working memory. However, more data are needed to achieve sufficient statistical power to detect …
-
Appreciating the Importance of Parasites: Analyzing and Understanding the Ecology of Parasite-Host Interactions
… interactions is usually gained by methods of statistical hypothesis testing, additional importance should be placed on the analysis and interpretation of parasite-host interactions. In this dissertation I address these ideas in three separate but interrelated studies with the three following …
-
Experimental Design of Single Cell Sequencing Experiments
… alternative experimental designs to increase statistical power. Single-cell sequencing enables high-throughput and high-dimensional studies of bio- logical systems. This is particularly useful in functional genomics screens that introduce perturbations to investigate and reconstruct the …
Page 1 of 12