Minsize2: a Computer Program for Determining Effect Size and Minimum Sample Size for Statistical Significance for Univariate, Multivariate, and Nonparametric Tests

The American Psychological Association’s editorial style urges authors to provide effect size estimates. Several journals, including Educational and Psychological Measurement, have adopted author guidelines that call for determining the minimum sample size necessary for a given result to have been declared statistically significant. MINSIZE2, a computer program that permits the user to determine both effect size and the minimum sample size needed for the results of a given analysis to be statistically significant, is described. Program applications for statistical significance tests for univariate, multivariate, and nonparametric statistics are provided. Explanation of the program’s operation is given, and examples are furnished.