[R] coxph with cluster() model selection

[Richard Chandler]

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