d_to_g: Standardized Mean Difference (d) Statistic to Unbiased...

In MAd: Meta-Analysis with Mean Differences

Standardized Mean Difference (d) Statistic to Unbiased Standardized Mean Difference (g)

Description

Eliminates the small upward bias of d to provide an unbiased estimate of the population effect size parameter (g). This procedure will compute g for a single value of d.

Usage

d_to_g(d, var.d, n.1, n.2)

Arguments

d	Standardized mean difference statistic (d has a slight bias).
var.d	Variance of d.
n.1	Sample size of treatment group.
n.2	Sample size of comparison group.

Value

g	Unbiased Standardized mean difference statistic.
var.g	Variance of g.

Author(s)

AC Del Re & William T. Hoyt

Maintainer: AC Del Re [e-mail]

References

Borenstein (2009). Effect sizes for continuous data. In H. Cooper, L. V. Hedges, & J. C. Valentine (Eds.), The handbook of research synthesis and meta analysis (pp. 279-293). New York: Russell Sage Foundation.

MAd documentation built on Aug. 7, 2022, 1:05 a.m.