Two-Stage Design for FDC [Two-Stage / GS Designs]

posted by Astea – Russia, 2019-06-06 01:24  – Posting: # 20319
Views: 412

Dear Smart People!

I'm wondering what is an appropriate way to use Two-Stage Designs for FDC (two analytes, A and B, for example)? It seems we are facing several questions:
1). Initial sample size calculation - best guess of CV for two CV?
2). Initial sample size calculation - power (see this thread). So if we would not expect independent hypothesis we should use the adjusted power for calculation. Correspondingly this will lead to neccesity of using additional simulations cause we will be automatically driven from validated values of 80 and 90%.
3). Interim analyses: for 2 analytes it leads to different possibilities: pass, fail, pass for A but need the second stage for B...
4). Sample size for the next stage:
- additional subjects could cause TIE inflation (as in the example with extra drop-outs, see this thread
- is it regulatory addopted - ignoring data for the second analyte?

"We are such stuff as dreams are made on, and our little life, is rounded with a sleep"

Complete thread:

 Mix view
Bioequivalence and Bioavailability Forum |  Admin contact
19,545 posts in 4,145 threads, 1,340 registered users;
online 8 (0 registered, 8 guests [including 5 identified bots]).
Forum time (Europe/Vienna): 11:45 CEST

Anyone who has never made a mistake
has never tried anything new.    Albert Einstein

BEBAC Ing. Helmut Schütz