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RegisterSample size prediction [Power / Sample Size]
posted by Helmut 
– Vienna, Austria, 2008-11-20 21:52 (6419 d 14:32 ago) – Posting: # 2754
Views: 5,337
Dear Ravi!
Yes and no. To quote Jaime in this post: 'Obviously 3x3 studies don't die out - but why?'
3x3 designs are flawed, see this post for details.
From a study in a 6×3 Williams' design you may calculate CVintra in the usual way as sqrt(exp(MSE)-1) and use it in sample size estimation for the 2×2 study. You may apply the same formula to a 3×3 study as well, but I don't have the slightest idea whether the result is unbiased.
❝ Can we predict Sample size for 2 x 2 crossover fasted study on the basis
❝ of estimates from a 3 x 3 crossover design [...]
Yes and no. To quote Jaime in this post: 'Obviously 3x3 studies don't die out - but why?'
3x3 designs are flawed, see this post for details.
❝ If yes please tell me the prodecure or formule to be used.
From a study in a 6×3 Williams' design you may calculate CVintra in the usual way as sqrt(exp(MSE)-1) and use it in sample size estimation for the 2×2 study. You may apply the same formula to a 3×3 study as well, but I don't have the slightest idea whether the result is unbiased.
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Helmut Schütz
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Dif-tor heh smusma 🖖🏼 Довге життя Україна!
Helmut Schütz
The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes
Complete thread:
- Sample size prediction Ravi 2008-11-20 12:57
![[Mix]](https://static.bebac.at/img/mix.png "open in Mix view")
- Sample size predictionHelmut 2008-11-20 20:52
Ing. Helmut Schütz