Initial sample size guess for the Potvin methods [Two-Stage / GS Designs]

posted by Helmut Homepage – Vienna, Austria, 2017-08-19 14:06  – Posting: # 17710
Views: 24,560

Hi ElMaestro,

I tried GetStartNps.X3(GMR=0.95, CV=0.2, Pwr.T=0.8) and was honored with
Error in Power.calc(nps1, GMR, CV, Is.St2 = 1) :
  could not find function "Power.calc"

Can you provide the function Power.calc(), please?

My standard code gives:

GMR              : 0.95
target power     : 0.8
‘best guess’ CV  : 0.2
Fixed sample size: 20
  power          : 0.835
‘Type 1’ TSD, n1 : 16 (80.0% of N)
  ASN            : 20.0
  power (interim): 0.619
  power (final)  : 0.851


How does it compare to yours?

Dif-tor heh smusma 🖖
Helmut Schütz
[image]

The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes

Complete thread:

Activity
 Admin contact
20,795 posts in 4,354 threads, 1,446 registered users;
online 8 (0 registered, 8 guests [including 4 identified bots]).
Forum time: 04:54 UTC (Europe/Vienna)

I’m not a pessimist,
I’m just a well informed optimist.    José Saramago

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