14 months for 1st review [Power / Sample Size]

posted by Helmut Homepage – Vienna, Austria, 2012-04-11 15:51 (5192 d 04:43 ago) – Posting: # 8407
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Dear Detlew!

❝ […] it must be stated: CI's given as ratios with 2 decimals acceptable!

❝ And that within that regulatory body which is responsible for the rule "... [image] to pass a CI limit of 80 to 125, the value would be at least 80.00 and not more than 125.00 ..."


Well, guidelines are guidelines are guidelines. ;-) Have you noticed the header on every single page?

Contains Nonbinding Recommendations

Rounding off of confidence interval values:

(my emphasis; you can try anything – if the assessor accepts it, …)

❝ I bet a case of best Czech beer that the lower limit for Cmax was something like 0.7988.


I wouldn’t bet on it. Why not even raise the claim to 0.795?

This review amazes me in many respects. After the stuff produced by M$ Word/Excel the pages again from an IBM Selectric.

I still have no clue how they derived their CIs. If I trust in the RMSE of 0.592, the PE of 108% for nT=62, nR=60 and a simple t-test I get a CI of 90–129%. If I play around with alphas (and round the CI to integers!) it needs an α1 of 0.0008 and α2 of 0.0992 to obtain a symmetrical CI (76–124%) but then the lower CL is <80%. Should stop this stupid trial-and-error business.

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