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Cohen's d is a generalized effect size measure. It is the difference between two group means scaled by the combined standard deviation. Cohen's d is used frequently in Jacob Cohen's text on power analysis, mostly to simplify the presentation of tables.

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Interpreting effect size

One of the most widely used interpretation of effect size is Cohen's $d$, as follows: $<.10$: trivial $[.10,.30]$: small to medium $[.30,.50]$: medium to large $>.50$: large to very large This ap …
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