As the posting guide asks, plese provide a small example.
Ales Ziberna
library(survival)Loading required package: splines
data(cancer) survreg(Surv(time, status)~age,data=cancer)
Call: survreg(formula = Surv(time, status) ~ age, data = cancer)
Coefficients: (Intercept) age 6.88712062 -0.01360829
Scale= 0.7587515
Loglik(model)= -1151.9 Loglik(intercept only)= -1153.9
Chisq= 3.91 on 1 degrees of freedom, p= 0.048
n= 228----- Original Message ----- From: "Richard Mott" <[EMAIL PROTECTED]>
To: <r-help@stat.math.ethz.ch>
Sent: Tuesday, April 26, 2005 11:32 PM
Subject: [R] 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
-- ---------------------------------------------------- Richard Mott | Wellcome Trust Centre tel 01865 287588 | for Human Genetics fax 01865 287697 | Roosevelt Drive, Oxford OX3 7BN
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______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
