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st: power calculation graphs


From   Nikolaos Pandis <npandis@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: power calculation graphs
Date   Fri, 20 Aug 2010 01:54:25 -0700 (PDT)

Hi to all.

I was wondering if someone would be able to help me draw the following sample calculation graphs with Stata:

1. Two arm parallel trial, outcome binary.

A power (y-axis) sample size (x-axis) calculation graph for various failure proportions between trial arms. For example, p1=0.80 and p2=0.85, or p1=0.80 p=0.90 or p1=0.80 p=0.95 


2. Two arm parallel trial, outcome continuous.

A power (y-axis) sample (x-axis) calculation graph for various failure proportions between trial arms. For example, m1= 100 and m2= 120 with equal sd1=sd2=10. It would be great if I could vary m1, m2, sd (always sd1=sd2)

Many thanks,

Nick


      
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