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

posted by ElMaestro  – Belgium?, 2017-11-14 00:04 (999 d 02:42 ago) – Posting: # 17976
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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.

I could be wrong, but...

Best regards,
ElMaestro

"Pass or fail" (D. Potvin et al., 2008)

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