[R] survreg with numerical covariates

From: Richard Mott <Richard.Mott_at_well.ox.ac.uk>
Date: Wed 27 Apr 2005 - 07:32:25 EST


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

-- 
----------------------------------------------------
Richard Mott       | Wellcome Trust Centre
tel 01865 287588   | for Human Genetics
fax 01865 287697   | Roosevelt Drive, Oxford OX3 7BN

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Received on Wed Apr 27 07:38:49 2005

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