Re: [R] Coxph with factors

From: Thomas Lumley <tlumley_at_u.washington.edu>
Date: Sun 17 Jul 2005 - 01:19:36 EST

On Sat, 16 Jul 2005, Thomas Lumley wrote:
>
> Yes, but you don't need to go via the baseline. The survival curves for
> any two covariate vectors z1 and z2 are related by
>
> S(t; z1)= S(t; z2)^(z1-z2)
>
Actually

   S(t; z1)=S(t;z2) ^(beta'(z1-z2))

of course.

         -thomas



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