0.95 or 1.05 [Power / Sample Size]

posted by Helmut Homepage – Vienna, Austria, 2018-10-10 11:41  – Posting: # 19428
Views: 15,573

Hi Oleg,

» […] can you explain your message to my colleagues in russian here

Interesting thread (as far as Google-translate took me). IIRC, some posters were not sure whether to use an assumed T/R-ratio of 0.95 or 1.05. Have a look at this post and that one. In short, if you assume a 5% difference but are not (very!) sure about the direction of the deviation (lower or higher than 100%), a study powered for 0.95 will always be sufficiently powered for 1.05 as well but not the other way ’round.

Cheers,
Helmut Schütz
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