On 3 Márta 2009, at 03:30, Sripal Kumar wrote:
I am trying to calculate the actual number of death in 2 groups
(treatment and intervention) with a 6 year cumulative survival of 41
and 49% based on the Kaplan Meier survival curve (unadjusted).
The actual number of deaths is easily got from your data - tabulate
your survival variable.
The problem is getting the death rates, which are based on person-
years at risk. Here, Stata's -stir- command will do the work for you,
giving the rates based on the available observation time.
At least, I think that's what you're asking...
Ronan Conroy
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Royal College of Surgeons in Ireland
Epidemiology Department,
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+353 (0)1 402 2431
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http://rcsi.academia.edu/RonanConroy
P Before printing, think about the environment
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