On Mon, 3 Apr 2006, Boudreau Jean-Francois wrote:
I am using a syntax like coxph(Surv(start, stop, event) ~ X, data) to
estimate the effect of X, which may change at each measurement (every 6
months). Is there anyone who knows a way to test the proportional hazard
assumption in that case?
You can use cox.zph(), or you can just put in interactions between X and
start.
-thomas
Thank you in advance
Jean-Fran?ois Boudreau
Sherbrooke University
[[alternative HTML version deleted]]
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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