Cohen's d is a standardised effect size for the difference between two group means, expressed in standard deviation units. d=0.2 is small; d=0.5 medium; d=0.8 large.
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Did You Know?
Jacob Cohen introduced these benchmarks in 1988, warning they are 'conventional' and context-dependent. A d=0.2 for a life-saving drug is enormous; in education it may be trivial.
References
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