“Forced BE” 101 [Power / Sample Size]

posted by kms.srinivas – India, 2017-12-27 13:41 (2399 d 13:11 ago) – Posting: # 18098
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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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