Message-ID: <1123702403.42fa568379190@mail-www2.oit.umass.edu>
Date: 2005-08-10T19:33:23Z
From: Richard Chandler
Subject: coxph with cluster() model selection
Hello,
Can someone suggest a strategy of selecting a parsimonious coxph model
when there is a cluster() term, a frailty() term and several
potentially important covariates? I have read in the R-help archives
that AIC can not be used when cluster() is.
My full model looks something like:
fit <- coxph(Surv(start, stop, fate) ~ x1 + x2 + x3 + x4 +
cluster(site) + frailty(year), data)
Thank you.
Richard
--
Richard Chandler
Department of Natural Resources Conservation
UMass Amherst
(413)545-1237