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Re: st: Sample size for equivalence trials in Stata

From   Jannik Helweg-Larsen <>
Subject   Re: st: Sample size for equivalence trials in Stata
Date   Sun, 2 Oct 2005 14:53:45 +0200

Apart from the suggestions by Joseph Coveney, these links may help: with a link to 
Stata code

the FAQ by Al Feiveson:

There is also the artmenu ado (findit artmenu: SJ5-1 st0013_1.  A menu-driven 
facility for complex sample size calculation randomized controlled trials with 
a survival or a binary update) which is supposed to provide non-inferiority 
sample size, however I haven't quite figured out how- the program does not seem 
accept two proportions of the same size..

The equivsize.ado by Philip Ryan is working very well- but should be limited in 
situations when proportions are less than 0.2- I wonder if other Stata based 
alternatives for calculating sample size  exists for e.g. non-inferiority 
studies with small proportions (0.2)?

Jannik Helweg-Larsen, MD
Epidemiafdeling M

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