Don’t use the formula by Chow, Shao, Wang! [Power / Sample Size]

posted by DavidManteigas – Portugal, 2017-08-03 18:12 (2250 d 23:07 ago) – Posting: # 17657
Views: 18,259

Thank you for the clarification Helmut, very helpful as always.

In the example you've mentioned on page 260 there is also another mistake, since z0.10 is 1.28 and not 0.84, so according to the reduced formula, 28 subjects per sequence would be necessary and not the reported 21. Still, significantly lower than the sample obtained with sampleNTOST.

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