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RegisterA better place to start. [Two-Stage / GS Designs]
Hi d_labes,
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.
❝ 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.
—
Pass or fail!
ElMaestro
Pass or fail!
ElMaestro
Complete thread:
- Two PK metrics: Inflation of the Type I Error Helmut 2017-11-12 11:57
![[Mix]](https://static.bebac.at/img/mix.png "open in Mix view")
- Two PK metrics: Inflation of the Type I Error? d_labes 2017-11-12 17:46
- A place to start ElMaestro 2017-11-12 21:43
- A place to start? d_labes 2017-11-13 16:02
- A place to start? Helmut 2017-11-13 16:51
- Scientific gut feeling d_labes 2017-11-15 10:34
- Five minutes gone - power.tsd.2m() arose d_labes 2017-11-15 13:15
- Scientific gut feeling d_labes 2017-11-15 10:34
- A better place to start.ElMaestro 2017-11-14 00:04
- Nope Helmut 2017-11-14 00:21
- Nope nobody 2017-11-14 08:11
- I've meditated hard ElMaestro 2017-11-14 12:41
- Nope Helmut 2017-11-14 00:21
- A place to start? Helmut 2017-11-13 16:51
- A place to start? d_labes 2017-11-13 16:02
Ing. Helmut Schütz