Kaplan-Meier for left truncated data?
On Fri, 26 May 2000, Fredrik Lundgren wrote:
R-users! How do I ask for the 'baseline hazard' of a coxph fit??
This interesting:
start <- c(1,2,1,1) stopp <- c(3,4,5,6) event <- c(1,1,1,1) library(survival5) survfit(Surv(start, stopp, event))
Error in survfit.km(X, Y, casewt, ...) : Can only handle right censored data Does not work :-(
res <- coxph(Surv(start, stopp, event) ~ 1) survfit(res)
Is ok! :-) G?ran
Fredrik Lundgren ----- Ursprungligt meddelande ----- Fr?n: "gb" <gb at stat.umu.se> Till: <r-help at stat.math.ethz.ch> Skickat: den 25 maj 2000 21:25 ?mne: Re: [R] Kaplan-Meier for left truncated data?
I have got two late answers to this question, from Mai Zhou and Bendix Carstensen. Both point out a 'trick': Use coxph to fit a model with no covariates and ask for the 'baseline hazard' of that fit! Unlike survfit, coxph allows for left truncated data. Thanks to both! G?ran
On Sun, 21 May 2000, gb wrote:
Is there a function somewhere for estimating the survivor function (plus confidence limits) when data are both left truncated and right censored? survfit in survival5 doesn't like left truncation.
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