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Back to the forum  Query: 2018-05-28 01:40 CEST (UTC+2h)

A better place to start. [Two-Stage / GS Designs]

posted by ElMaestro - Denmark, 2017-11-14 00:04  - Posting: # 17976
Views: 1,599

Hi d_labes,

» But that's not the problem Helmut has described, at least as I understand it. Here we initiate a stage 2 from the perspective of the AUC evaluation where it is not neccessary to initiate one.

Best I can come up with is as follows:
The only thing that determines the need for for stage 2 is the CV.
AUCt is generally having a lower CV than Cmax (for the record, I said 'generally', I did not say 'always'). Often it is about 5-20 percentage points.

So run the sims in the usual fashion, but add 5-20 points on the CV for the power and sample size estimation.

“A ten-year, double-blind study from the Mayo Clinic concluded that even in late stages of dementia, the last to go is the lobe of the brain in charge of cafeteria layout.” (Serge Storms/Tim Dorsey).

Best regards,

- Bootstrapping is a relatively new hobby of mine. I am only 30 years late to the party.

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