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st: test for heterogeneity


From   "Anthony Moorman" <A.V.Moorman@soton.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: test for heterogeneity
Date   Thu, 7 Oct 2004 13:28:38 +0100

Dear Statalisters,

I need to perform a test for heterogeneity in the following situation:

A log-rank test - sts test - showed a significant difference in outcome
between subgroups A and B. 

The results of a repeated test stratifying by treatment X and Y -
strata(treatment) detail - suggested that the difference between A and B
only occurred with treatment Y. 

I want to perform a test for heterogeneity to determine whether the effect
between A and B is the same within the two treatment groups X and Y. How can
I do this is Stata?

Many thanks for your help

Anthony

Anthony V. Moorman, PhD
LRF Senior Scientist,
LRF Cytogenetics Group,
Cancer Sciences Division,
University of Southampton,
MP822, Duthie Building,
Southampton General Hospital,
Tremona Road, Southampton, SO16 6YD
Tel: (023) 8079 8403
Fax: (023) 8079 6432


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