Dear R-users,
I know that a few people have asked whether survreg handles left-truncation
data and the reply that i have seen so far is that it does.
However, when I try to use survreg on left-truncated data, I got the
following error message.
> survcs3<-survreg(Surv(start,end,status)~AG, data=DPONEcs3,
dist="exponential")
Error in survreg(Surv(start, end, status) ~ AG, data = DPONEcs3, dist =
"exponential") :
Invalid survival type
Then i tried
> cc<-survreg(Surv(end,status)~AG, data=DPONEcs3, dist="exponential")
and it works perfectly fine.
May I know why survreg does not accept my left-truncated data? I used
similar set of data on coxph and it works fine
Many many thanks for your time and any comments given
kind regards,
sing yee
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