Message-ID: <4ED7B2A9.1090607@nki.nl>
Date: 2011-12-01T17:00:25Z
From: Andreas Schlicker
Subject: What's the baseline model when using coxph with factor variables?
Hi all,
I'm trying to fit a Cox regression model with two factor variables but
have some problems with the interpretation of the results. Considering
the following model, where var1 and var2 can assume value 0 and 1:
coxph(Surv(time, cens) ~ factor(var1) * factor(var2), data=temp)
What is the baseline model? Is that considering the whole population or
the case when both var1 and var2 = 0?
Kind regards,
andi