INSTRUCTIONS: First, enter the number of sub-groups (i.g., moderator-based categories). Then, for each sub-group, enter its standard deviation for the criterion Y, sample size, standard deviation for the predictor X, and correlation between X and Y. Then, click on "Calculate" to obtain the effect size for the categorical moderator variable (i.e., interaction effect between a continous and a categorical varible).
Sources: [copyright
notice: You may download these article for one-time personal use only; please
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Aguinis, H., Beaty, J. C., Boik, R. J., & Pierce, C. A. 2005. Effect size and power in assessing moderating effects of categorical variables using multiple regression: A 30-year review.
Journal of Applied Psychology, 90(1): 94-107. [click here
to view article]
Aguinis, H., & Pierce, C. A. 2006. Computation of effect size for moderating effects of categorical variables in multiple regression. Applied Psychological Measurement, 30(5): 440-442. [click here to view article]
