[R] Survival, Kaplan-Meier, left truncation

Rau, Roland Rau at demogr.mpg.de
Wed Jan 7 12:57:46 CET 2004

Dear all,

I have data from 1970 to 1990 for people above age 50.
Now I want to calculate survival curves by age starting at age 50 using the
Kaplan Meier Estimator.
The problem I have is that there are already people in 1970 who are older
than 50 years.
I guess this is called delayed entry or left truncation (?).

I thought the code would be:

roland <- survfit(Surv(time=age.enter, time2=age.exit, event=status,
type="interval")~1, weights=gewicht,

But then R tells me that it can handle only right-censored or counting data.

Is there another function which allows me to calculate the Kaplan Meier


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