Hi All,

In absence of any reply, I am posting a slightly modified question. What is
"x" in hazard.ratio in the command below?

example(hazard.ratio)

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

*

hazard.ratio(x=?, surv.time=train$ProgFreeSurv,
surv.event=train$PfSStatus, strat=binscores)

*

Input to "x" is ("x a vector of risk predictions"), what does it mean?
I have computed scores (binscore) above from a 100-gene signature I
have derived from an expression data. I need to compute hazard rations
of the groups (low and high) defined by me using "cut" command above.

Thanks, Angel.

------

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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