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| g = approx. d (1 - { 3/[4(n1+n2)-9)] } | g = approx. d times {1 - ( 3/[4(n1+n2)-9)] ) } |
How do I compute a Hedge's g from a Cohen's d
The below is taken from here.
An unbiased version of d can be calculated using the following equation adapted from Hedges and Olkin (1985, p.81):
g = approx. d times {1 - ( 3/[4(n1+n2)-9)] ) }
Hedge's g is recommended for sample sizes of 20
References
Hedges, L.V. and I. Olkin (1985) Statistical Methods for Meta-Analysis. London: Academic Press.