help cohend-------------------------------------------------------------------------------

Title

cohend-- Calculates Cohen'sd, Hedges'g, and the effect size (ES) correlation > (r) corrected for uneven group size.

Syntax

cohendvarnamegroupvar

Description

cohendcomputes Cohen'sd, Hedges'g, and effect size (ES) correlations (r) for the two variables specified invarlist. The first variable specified should correspond to the dependent variable, and the second variable should correspond to the grouping variable. These values are calculated from the equations specified in Rosnow, Rosenthal, and Rubin (2000).The command also displays the effect size corrected for uneven group size. This should be used when the difference in cell size between the two groups is large. The corrected version of Cohen's

dis calculated from equation 14, Hedges'gfrom equation 13, and ESrfrom equation 15 in Rosnow et al. (2000).

Examples.

cohenddv condition

ReferencesRosnow, R. L., Rosenthal, R., & Rubin, D. B. (2000). Contrasts and correlations in effect-size estimation.

Psychological Science,11(6), 446-453.

AuthorDavid Tannenbaum, University of California, Irvine dtannenb@uci.edu

cohend v1