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How to fit parametric survival model using counting process data

Hi,

I was trying to fit a parametric survival model with Weibull distribution on
counting process type of data (NOT interval censor data), but the
survreg(Surv(T1,T2,event)~x,data,dist="weibull") did not seem to work.
Anyone can help me with that?

Thanks,

Rachel
Memorial Sloan-Kettering Cancer Center