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Cohen’s d

Cohen’s d n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

..., the most familiar form being the difference between two means ( M 1 and M 2 ) expressed in units of standard deviations : the formula is d = ( M 1 − M 2 )/ σ , where σ is the pooled standard deviation of the scores in both groups. A value of d below 0.20 is considered small, 0.50 medium, and 0.80 large. [Named after the US psychologist Jacob (Jack) Cohen ( 1923–98 ) who devised it and popularized it in his book Statistical Power Analysis for the Behavioral Sciences ( 1969 , 1988...

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