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fit_coxph
2008 Aug 15
1
estimating the proportion without recurring ailment based on the nelson-aalen estimator
...urvival type, with "start"-"stop" dates and whether the individual had the ailment in that interval.
Some cases are observed until database closure and some died or are lost to followup. The interest is not on death. I have tries using "coxph" and "cph" as
fitCOXPH <- coxph(Surv(time=start,time2=stop,sick)~strata(adult)+frailty(individual),data=test.data)
fitKM <- survfit(fitCOXPH )
summary(fitKM ,times=sort(seq(0,128,by=16)))
What I noted is that the proportion was decreasing with increasing time, which I felt was incorrect!
I then tried estimating t...