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Erratum: Planning Study Size Based on Precision Rather Than Power

doi: 10.1097/EDE.0000000000000924
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With regard to the article by Rothman KJ1 et al. in the September issue of Epidemiology, the authors are grateful to a reader for pointing out a mistake in the standard error formula for log of risk ratio that appeared in the table found in the supplemental digital content. A revised table has been uploaded with the corrected formula to:


1. Rothman KJ, Greenland S. Planning study size based on precision rather than power. Epidemiology. 2018;29(5):599603.

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