Message-ID: <426EB369.9040900@well.ox.ac.uk>
Date: 2005-04-26T21:32:25Z
From: Richard Mott
Subject: survreg with numerical covariates
Does anyone know if the survreg function in the survival package can fit
numerical covariates ?
When I fit a survival model of the form
survreg( Surv(time,censored) ~ x )
then x is always treated as a factor even if it is numeric (and even if
I try to force it to be numeric using as.numeric(x). Thus, in the
particular example I am analysing, a simple numerical covariate becomes
a factor with 190 levels. Is this the expected behaviour ? Am I doing
something wrong ?
I am running R 2.0.1 on a 64bit Debian Linux system, and version 2.17 of
the survival package
Thanks
Richard Mott
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Richard Mott | Wellcome Trust Centre
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