[R] testing proportional hazard in a Cox model including atime-varying covariate

[Christos Hatzis]

See 

?cox.zph 

in library 'survival' 

-Christos

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Boudreau
Jean-Francois
Sent: Monday, April 03, 2006 2:58 PM
To: r-help at stat.math.ethz.ch
Subject: [R] testing proportional hazard in a Cox model including
atime-varying covariate

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?

 

Thank you in advance

 

Jean-Frangois Boudreau

Sherbrooke University

 


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