DCR-4 Errata (updated July 8, 2014)
Designing Clinical Research
Fourth Edition, LWW, 2013
(S. B. Hulley, S. R. Cummings, W. S. Browner, et al.)
Page 80, equation near the bottom of the page
N = 4ZαS2 ÷ W2
N = 4Zα2S2 ÷ W2
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