R help - Feb 2011 - hazard ratio between my groups

HI,

I am interested in calculating hazard ratio of the stratified groups defined
by me.

library(survcomp)
binscores <-
cut(scores.train,c(-1000,-1,1,1000),c("low","intermediate","high"))

dd <- data.frame("surv.time"=OS, "surv.event"= status,
"strat"=binscores)
km.coxph.plot(formula.s=Surv(surv.time, surv.event) ~ strat)

How do I calculate hazard ratio between the groups defined by me as above?
Thanks very much,
Angel

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