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Sensitivity to Attrition for Inferences from an RCT
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Kenneth A. Frank – Grantee Submission, 2025
Most randomized field experiments experience some attrition. Moreover, the extent of attrition may differ by treatment condition in systematic, non-random ways, biasing estimates of treatment effects and contributing to invalid inferences. We address concerns about non-random attrition by quantifying the conditions necessary in the attritted data…
Descriptors: Attrition (Research Studies), Randomized Controlled Trials, Inferences, Correlation
The Power and Type I Error of Wilcoxon-Mann-Whitney, Welch's "t," and Student's "t" Tests for Likert-Type Data
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Simsek, Ahmet Salih – International Journal of Assessment Tools in Education, 2023
Likert-type item is the most popular response format for collecting data in social, educational, and psychological studies through scales or questionnaires. However, there is no consensus on whether parametric or non-parametric tests should be preferred when analyzing Likert-type data. This study examined the statistical power of parametric and…
Descriptors: Error of Measurement, Likert Scales, Nonparametric Statistics, Statistical Analysis
MINISIZE2: A Computer Program for Determining Effect Size and Minimum Sample Size for Statistical Significance for Univariate, Multivariate, and Nonparametric Tests.
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Morse, David T. – Educational and Psychological Measurement, 1999
Describes the MINISIZE 2 computer program, which permits the user to determine the effect size and the minimum sample size needed so that results of a given analysis will be statistically significant. Explains the program's operation and provides examples. (SLD)
Descriptors: Computer Software, Effect Size, Nonparametric Statistics, Sample Size