Stop estimating post hoc power! [Power / Sample Size]

posted by Helmut Homepage – Vienna, Austria, 2017-12-26 12:22  – Posting: # 18084
Views: 19,579

Hi kms,

» I'm getting surprising results always that I'm taking sample size with 80% power and by coming to the results always 98 Power it is reaching....How it is possible always?

If the irrelevant post hoc power is always 98%, I suspect a flaw in the software (or SAS macro).
If it is always higher than the one used in sample size estimation it may be a miscalculation – ineradicably “popular” in Indian CROs (see this post). Revise your procedures.

Cheers,
Helmut Schütz
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