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zpfit
2009 Mar 16
0
hazard function in a Cox model
...--- end inclusion ----
The best tool for understanding what is happening is cox.zph.
cox.V <- coxph(Surv(intDaysUntilFVPO, Event_v) ~ intAgeAtMHCIndex +
PRE + group + MHC + strGender, data = recidivismv)
zpfit <- cox.zph(cox.V, transform='identity')
plot( zpfitp[1]) #plot for the first variable
plot( zpfitp[2]) #plot for the second
You will get a plot of beta(t) versus time, a horizontal line corresponds to a
constant hazard ratio. The Cox model coefficient is an "average" of the curve,
e.g., the best horizontal line fit to it....