Message-ID: <200902270850.n1R8oA1X028978@hypatia.math.ethz.ch>
Date: 2009-02-27T08:42:59Z
From: Heinz Tuechler
Subject: survival::survfit,plot.survfit
In-Reply-To: <200902261428.n1QESjg27531@hsrnfs-101.mayo.edu>
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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