FDC Power [Power / Sample Size]

posted by mittyri – Russia, 2014-03-20 21:55 (3661 d 02:53 ago) – Posting: # 12681
Views: 6,840

Dear All,

I would like to discuss some issues in FDC studies design.
For examle, we have FDC with 2 APIs. Let's say we know that no PK interaction is expected and the intraCVs in the pilot study were similar to the single dosage forms.
If we calculate the sample size for the first API (ABC) and the second API (XYZ) with a power 80%, we'll get some values.
So... We have only 80% of probability to prove BEQ for ABC (20% of II type error) and 80% for XYZ.
Final probability is 80%*80%=64%! :confused:
Should we use another power for calculations (89%*89%=80%)?

Can someone correct or comment my statistical calculations?
What about triple FDC (92.8%*92.8%*92.8%=80%)?

Kind regards,
Mittyri

Complete thread:

UA Flag
Activity
 Admin contact
22,957 posts in 4,819 threads, 1,636 registered users;
87 visitors (0 registered, 87 guests [including 11 identified bots]).
Forum time: 00:48 CET (Europe/Vienna)

Nothing shows a lack of mathematical education more
than an overly precise calculation.    Carl Friedrich Gauß

The Bioequivalence and Bioavailability Forum is hosted by
BEBAC Ing. Helmut Schütz
HTML5