[R] survival::survfit,plot.survfit

[Jeff Xu]

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

Regards
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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