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Direct linkPaul T. von Hippel – Educational Evaluation and Policy Analysis, 2025
Educational researchers often report effect sizes in standard deviation units (SD), but SD effects are hard to interpret. Effects are easier to interpret in percentile points, but converting SDs to percentile points involves a calculation that is not transparent to educational stakeholders. We show that if the outcome variable is normally…
Descriptors: Effect Size, Computation, Mathematical Concepts, Statistical Distributions
