[R] questions about coxph.detail

From: singyee ling <singyee.ling_at_googlemail.com>
Date: Sat 21 Jan 2006 - 03:52:01 EST

Dear R- users,

I obtained a coxph object using the coxph function and use the coxph.detail function to understand what coxph function actually does.

what follow are the R output

fit<-coxph(Surv(B3TODEATH,STATUS)~GROUP+AGE+SEX+SEX:AGE) detail<- coxph.detail(fit)


.... .(rows of events time)


......(a matrix consisting of mean of each variable at event time)


......( number of event at unique event time)


......(number of ppl at risk at each event time)


.......(hazard at each event time)


okay, my question is on how the hazard at each event time is calculated. I suspect that it is h(t) = (nevent(t)/nrisk(t))* exp( sum(coeff* means(t)). Am I right? if not, how is the hazard actually calculated?

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