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fitk
2008 Aug 15
1
estimating the proportion without recurring ailment based on the nelson-aalen estimator
...n 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 the number without the ailment in each discrete month, but computing the denominator (the number alive...