survival::survfit,plot.survfit
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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