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@GaryMarcus

@emollick it’s certainly not “HUGE” by conventional interpretations; in traditional psychology (Jacob Cohen’s d) .15 is small; even in the context of education I am skeptical, and see quote below from Interpreting Effect Sizes of Education Interventions Matthew A. Kraft), which would still count it as medium, not large and certainly not all caps HUGE. But th thing about effect sizes of 0.15 in my experience is that there is usually enough of a confidence interval around it that you can’t be sure how real it is. That was Cohen’s point. (source for the 6-9 months?)

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