Message-ID: <200905111251.n4BCprov026210@yacko.mayo.edu>
Date: 2009-05-11T12:51:53Z
From: Terry Therneau
Subject: Comparing COXPH models, one with age as a continuous variable
The "anova" process is only statistically valid for nested models, i.e., where
one includes the other as a proper subset. A model with continuous age and one
with discrete age are not nested; your p-value will be meaningless.
Terry Therneau