[R] survival::survfit,plot.survfit

Jeff Xu jeffxu at live.com
Thu Feb 26 17:20:10 CET 2009

Thanks very much, Bernhard and Terry.
It clarify my confusion and really helps a lot.

Jeff Xu

Terry Therneau wrote:
>> plot(survfit(fit)) should plot the survival-function for x=0 or 
>> equivalently beta'=0. This curve is independent of any covariates.
>   This is not correct.  It plots the curve for a hypothetical subject with
> x= 
> mean of each covariate.  
>   This is NOT the "average survival" of the data set.  Imagine a cohort
> made up 
> of 60 year old men and their 10 year old grandsons: the expected survival
> of 
> this cohort does not look that for a 35 year old male.
>   	Terry T
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