Message-ID: <Pine.GSO.4.21.0005261053390.4254-100000@atlas.biostat.washington.edu>
Date: 2000-05-26T17:54:59Z
From: Thomas Lumley
Subject: SV: [R] Kaplan-Meier for left truncated data?
In-Reply-To: <003901bfc73b$41a82640$b0c643c3@oemcomputer>
On Fri, 26 May 2000, Fredrik Lundgren wrote:
> summary of "How do I ask for the 'baseline hazard' of a coxph fit??"
>
> Thank you to Thomas Lumley, Brian Ripley, Göran Bodström and Bendix
> Cartensen for their tips to use plot(survfit(a.coxph.fit)). Thomas
> Lumley suggests that to get the "real baseline hazard" I should use
> -log(survfit(a.coxph.fit)$surv) and set all covariates=0 in which case
> I need to supply these values to survfit. But how do you supply
> covariate values to survfit? Shouldn't they be supplied to coxph in
> some way?
No, to survfit. coxph fits the model, it doesn't care what you do to it
afterwards. If you look at the documentation for survfit() it has a
data= argument to specify which covariates values you want the survival
curve for.
-thomas
Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle
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