[R] need some help about using R for Kaplan-Meier estimator

Peter Dalgaard p.dalgaard at biostat.ku.dk
Sun Feb 1 20:33:36 CET 2009

chen chen wrote:
> Hi Fello:

> I am asked to compute the Kaplan-Meier estimator of data with right
censoring without using surfit().

I.e., a homework problem...

For such problem people will at best offer hints.

The KM estimator is the

---> cumulative product


---> decrements

that depend on

---> the number at risk at the event times.

This gives you a list of three things that you need to figure out how to 

 > Does anyone know how to use R to
compute the estimators?
> The data should input X: vector of right-censored observed time for n
individuals, and d: vector of failure time indicators (0=censored
individual;1=unconsored individual)
> and the function should return with t: vector of sorted observed
> event times, in increasing order; and km:
vector of Kaplan-Meier estimates, corresponding to t.
> Best Regards,
> _________________________________________________________________
> owitworks_012009
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    O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
   c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
  (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
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