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emagnification: A tool for estimating effect-size magnification and performing design calculations in epidemiological studies

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Artificial effect-size magnification (ESM) may occur in underpowered studies, where effects are reported only because they or their associated p-values have passed some threshold. Ioannidis (2008, Epidemiology 19: 640-648) and Gelman and Carlin (2014, Perspect... ...