total (pooled) variance: examples [Power / Sample Size]

posted by Nav Coelho – 2007-07-23 21:58 (5978 d 13:32 ago) – Posting: # 927
Views: 22,357

Dear Helmut,

I really appreciate you taking the time to answer my questions in such detail. In regards to the sample size calculation for a parallel design, I agree that the worst case scenario for taking total CV as the estimate for inter CV would only result in slight overestimation in power. Thanks for the confirmation!!

As for the 60% rule, you are absolutely right. It's not a one size fits all.


Edit: Full quote removed. Please see this post! [Helmut]

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