Hedges' g is a measure of effect size. Effect size tells you how much one group differs from another—usually a difference between an experimental group and control group. ... Hedges' g is therefore sometimes called the corrected effect size. For very small sample sizes (<20) choose Hedges' g over Cohen's d.
What does negative hedges G mean?
A negative Hedges' g indicates that an intervention results in poorer scores for children receiving it than for a control group. Positive Hedges' g values indicate that an intervention has “worked” to some extent and quantify the benefit produced by an intervention.
How do you get hedge G?
Here is how to calculate Hedges' g for these two samples:
- g = (x1 – x2) / √((n1-1)*s12 + (n2-1)*s22) / (n1+n2-2)
- g = (15.2 – 14) / √((39-1)*4.42 + (34-1)*3.62) / (39+34-2)
- g = 1.2 / 4.04788.
- g = 0.29851.
