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

posted by BEQool  – 2023-04-22 20:20 (418 d 20:49 ago) – Posting: # 23537
Views: 2,580

Thank you zizou for the explanation.

So if we have e.g. 3x6x3 Williams crossover design (with 3 treatments), the number in the denominator depends on the approach we use?
If we use "Two at a Time" approach with incomplete block designs, we are only evaluating 2 treatments and therefore we should use number 2 in the denominator; but if we use "All at Once" approach, we are evaluating all 3 treatments and we have to use number 3 in the denominator?

Additional question (just to be sure): we also use number 2 in the denominator (to get inter-subject variance) when we have replicate designs with 2 treatments (regradless of the partial- or full-replicate design)?

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