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Planning Study Size Based on Precision Rather Than Power

Rothman, Kenneth J.a,b; Greenland, Sanderc

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doi: 10.1097/EDE.0000000000000876



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:

Epidemiology. 30(1):e1, January 2019.

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