SV: [R] Kaplan-Meier for left truncated data?

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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