To whom it may concern [Two-Stage / GS Designs]

posted by d_labes  – Berlin, Germany, 2016-03-07 11:41 (2272 d 05:14 ago) – Posting: # 16064
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Dear ElMaestro,

you are totally right IMHO.
The reason why statisticians (some of) are accepting simulations only for type II error are the different roles of power and type I error.

Ideal statistical tests meet the rule that type I error is <=0.05 or some other threshold agreed upon. Using simulations to determine this has the drawback that you only can show this for the scenarios you have simulated. Not for the general case. Therefore a proof assuring no alpha-inflation is preferred.

Power on the other hand is useful for planning purposes (only). No strict criterion has to be applied to this term in general.

Regards,

Detlew

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