An issues I always wondered about - "multiplicity" for power [Power / Sample Size]

posted by ElMaestro  – Denmark, 2015-11-06 11:39 (3390 d 07:48 ago) – Posting: # 15624
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Steven,

❝ From my point of view, this may simply be a misleading finding due to chance, because, staying in that example, conducting three studies at a power of 80% will result in a fifty-fifty chance to have all of them being successful (0.8^3). By implication, it might even be reasonable to "overpower" each single study in order to end with an "overall power" of 80% (0.93^3 is roughly 80%).


You are absolutely correct and the industry would be in a much better shape if its people were generally thinking like you.
Well done :-)

Pass or fail!
ElMaestro

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