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st: survival analysis


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   st: survival analysis
Date   Wed, 24 Sep 2008 10:59:14 +0100 (BST)

--- Moleps wrote:
> 1) Reading the medical literature most retrospective survival
> analysis is done with Kaplan Meier curves. Is it not more appropriate
> to use Cox graphs where other covariates have been adjusted for?
> 2) Some report both univariate and then multivariate data on their
> variables. What is the correct thing to do?

Depends on the aim. A Kaplan Meier curve is an excelent way of
describing the data. Such a describtion is crucial, as any modeling
later on (e.g. Cox regression) is only a manipulation of this raw
material. Also controling for a covariate is not necesarily a good
thing: a very common mistake is that people don't distinguish between
intervening and confounding variables.

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      
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