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2013 Mar 14
1
cnfidence intervals for survfit()
Hi, I am wondering how the confidence interval for Kaplan-Meier estimator is calculated by survfit(). For example,
> summary(survfit(Surv(time,status)~1,data),times=10)
Call: survfit(formula = Surv(rtime10, rstat10) ~ 1, data = mgi)
time n.risk n.event survival std.err lower 95% CI upper 95% CI
10 168 55 0.761 0.0282 0.707 0.818
I am trying to reproduce the upper and lower CI by using standard error. As far I understand, the default method for survfit() to calculate confidence...
2013 Mar 15
0
confidence interval for survfit
...On 03/15/2013 06:00 AM, r-help-request at r-project.org wrote:
> Hi, I am wondering how the confidence interval for Kaplan-Meier estimator is calculated by survfit(). For example,?
>
>> > summary(survfit(Surv(time,status)~1,data),times=10)
> Call: survfit(formula = Surv(rtime10, rstat10) ~ 1, data = mgi)
>
> ?time n.risk n.event survival std.err lower 95% CI upper 95% CI
> ?? 10 ?? 168????? 55??? 0.761? 0.0282??????? 0.707??????? 0.818
>
>
> I am trying to reproduce the upper and lower CI by using standard error. As far I understand, the default method for survfi...