[R] survival::survfit,plot.survfit

[Heinz Tuechler]

At 15:28 26.02.2009, 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.

Does this mean, the curve corresponds to the one you would get based 
on the base line hazard?

Heinz


>   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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