The reader-friendliness of effect sizes

Effect size has long been the standard measurement used in educational research. This commonality allows for comparison across studies, between programs, and so on. It’s a tricky statistic, though, because its implications are not necessarily understood by the typical consumer of research. For example, saying that a program has an effect size of +0.13 is likely to be less meaningful to the layperson than saying that a program yielded a gain of one month’s learning.

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