Thanks for your help.
But I need to estimator the standard error of the quantile in "survival
analysis", because my data is censored.
For example~
T<-c(84,240,261,332,348,437,521,565)
S<-c(0,1,1,0,1,0,1,0) ##0 for censoed; 1 for event
G<-rep(1,8)
ori_s.surv<-survfit(Surv(T,S)~G)
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