Hello:
Assuming that I have used the coxph function to fit a Cox model with several
covariates, is there a natural way to estimate a value of the survivorship
function at, say, five years,
S(5), along with a confidence interval? I have brought this question up
with one or two colleagues, who have suggested using a parametric model, but
I wonder whether it can be done using the semiparametric coxph() model.
Thanks.
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[R] Estimating Survival function in coxph
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Thomas Lumley at Oct 30, 2000 at 4:47 am ⇧ Yes. The survfit() function does this. There are a few options for exactlyOn Wed, 25 Oct 2000, Richards, Tom wrote:
Hello:
Assuming that I have used the coxph function to fit a Cox model with several
covariates, is there a natural way to estimate a value of the survivorship
function at, say, five years,
S(5), along with a confidence interval? I have brought this question up
with one or two colleagues, who have suggested using a parametric model, but
I wonder whether it can be done using the semiparametric coxph() model.
how to do it. They are moreorless equivalent if a lot of people are
still at risk at this time. It is necessary to estimate either the
baseline hazard function using something like the NelsonAalen estimator
or the baseline survival function using something like the KaplanMeier
estimator.
thomas
Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle
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