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Re: st: Sample size for equivalence trials in Stata


From   Jannik Helweg-Larsen <jhelweg@dadlnet.dk>
To   statalist@hsphsun2.harvard.edu
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:

http://www.jhucct.com/CCT/present/SCTMay2004/SCT%20poster.pdf- with a link to 
Stata code

the FAQ by Al Feiveson: http://www.stata.com/support/faqs/stat/power.html

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
Rigshospitalet

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