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Psychology and Aging
A general rationale and specific procedures for examining the statistical power characteristics of psychology-of-aging empirical studies are provided. First, 4 basic ingredients of statistical hypothesis testing are reviewed. Then, 2 measures of effect size are introduced (standardized mean differences and the proportion of variation accounted for by the effect of interest), and methods are given for estimating these measures from already-completed studies. Power and sample size formulas,doi:10.1037/0882-79126.96.36.199 fatcat:q4ueow4mrjh25ljmrh4ftmcuiq