Erratum to: Unequal Center Sizes, Sample Size, and Power in Multicenter Clinical Trials
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dh= (Zl-dZ + Zl-PA) / (z1-cra/2 Zl-PA
= 4 1 (z,-cra/2
+ z1-P)
+ z1-p) - Z,-d,
Note that the formula is repeated in Table 1 as a footnote and should be changed as well. Tables 1 and 3 Column Heading: 1 - d 2 should be 1 - a All tables use correct results. It is only the text that is incorrect.
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