Calculates Hedges' g, a standardized effect size for comparing means. This version includes a small-sample correction factor (omega) and uses the pooled standard deviation.
hedgesG(n_t, n_c, y_t, y_c, s_t, s_c)The calculated Hedges' g effect size.
Numeric value representing the sample size of the treatment group.
Numeric value representing the sample size of the control group.
Numeric value representing the mean of the treatment group.
Numeric value representing the mean of the control group.
Numeric value representing the standard deviation of the treatment group.
Numeric value representing the standard deviation of the control group.
Hedges' g is a variation of Cohen's d that adjusts for small-sample bias. It is calculated as the difference in means divided by the pooled standard deviation, then multiplied by a correction factor.
Hedges, L. V. (1981). Distribution theory for Glass's estimator of effect size and related estimators. Journal of Educational Statistics, 6(2), 107-128.