*Pretests Posttests; Simulation

A special case of the homogeneity of effect size test, as applied to pairwise comparisons of standardized mean differences, was evaluated. Procedures for comparing pairs of pretest to posttest effect sizes, as well as pairs of treatment versus control group effect sizes, were examined. Monte Carlo simulation was used to generate Type I error rates and power values for tests of the differences in independent effect sizes based on both the "g " and "d " methods. Type I error rate was evaluated by crossin