“Forced BE” 101 [Power / Sample Size]

posted by kms.srinivas – India, 2017-12-27 12:41  – Posting: # 18098
Views: 23,294

(edited by kms.srinivas on 2017-12-27 13:12)

Dear Helmut,
Much pleasure with your reply.

» study planned for 90% power: The chance to obtain a post hoc power of ≥95% is ~35%.

Is it a thumb rule? how it should be calculated?

» It only means that
»    – the CV was lower and/or
»    – the GMR closer to 1 and/or
»    – you had less dropouts than assumed.

Yes, on getting posthoc analysis, i found three aspects what you said:
After experiment, it came to know that
1. CV getting lower
2. GMR close to 1
3. No dropouts/withdrawls (though prior consideration of 10% dropouts)

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