A Kurtosis-Adjusted Bias Correction for the Standardized Mean Difference: Extending Hedges’ g to Nonnormal Populations
Educational and Psychological Measurement
Published online on July 02, 2026
Abstract
Educational and Psychological Measurement, Ahead of Print.
The standardized mean difference (SMD) is the most widely used effect size measure in the behavioral, educational, and social sciences. Hedges’g, which applies a bias correction factor to Cohen’sd, assumes normally distributed populations. This article ...
The standardized mean difference (SMD) is the most widely used effect size measure in the behavioral, educational, and social sciences. Hedges’g, which applies a bias correction factor to Cohen’sd, assumes normally distributed populations. This article ...