R help - Dec 2011 - predict risk (% of death) at a certain time point

Dear all,

Does any one know how to calculate the risk (death rate) at some time point (say
5 yrs) based on Kaplan-Meier curve in coxph model in R? I know how to fit the
survival data with coxph. But need to calculate risk at some time point. Many
thanks.

Bill

On Dec 19, 2011, at 10:05 PM, Bill Hyman wrote:
> Dear all,
>
> Does any one know how to calculate the risk (death rate) at some  
> time point (say 5 yrs) based on Kaplan-Meier curve in coxph model in  
> R? I know how to fit the survival data with coxph. But need to  
> calculate risk at some time point. Many thanks.
Have you looked at either:

?survfit.coxph
?predict.coxph   # with type ="expected"

This seems to be a particularly common question this week. Is there  
some sort of class project that is due before the holidays?


-- 
David Winsemius, MD
West Hartford, CT