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straat
2009 Oct 27
2
cox regression extract strata as numeric
Hi there,
I perform a stratified cox and then I need the strata as a numeric array "straft.ln"
ft.ln <- coxph(Surv(times,deaths)~ages+chemos+chemos:f1+chemos:f2+horms+horms:f1+horms:f2+grades+grades:f1+grades:f2+positives+positives:f1+positives:f2+sizes+sizes:f1+sizes:f2+strata(stra),data=ddd)
basehazzft.ln=basehaz(ft.ln,centered=FALSE)
H0ft.ln=c(basehazzft.ln[,1])
timeft.ln=c(b...