[R] rpart with interval censored data crashes R

[Keith Jewell]

Thanks for such a complete answer, that is very helpful.

Best regards,

Keith Jewell

"Terry Therneau" <therneau at mayo.edu> wrote in message 
news:200901121858.n0CIw0g06846 at hsrnfs-101.mayo.edu...
>
> Thank you for the input on rpart -- I just saw the message today.
>
> 1. You are right, it should not crash.  Why it crashes rpart is simply 
> that I
> (the author) never ever tried using interval censored data in the call. 
> Real
> users try the most amazing things....
>  I'll fix it in my local version, but putting in a "no no no" message.  My
> local version and the R version, maintained by Brian, have drifted quite 
> far
> apart however.
>
>  2. Rpart deals with right censored data using the same trick as Cox 
> models, by
> thinking of it as observation of a Poisson process; number of events seen 
> over a
> given time window.  The fact that the number is always 0 or 1 doesn't 
> hinder the
> mathematical trick, which is based in counting process theory.
>  BUT - the trick only works for right censored data.
>
>  Using the mid points of your intervals is the only approach that comes 
> readily
> to mind.
>
>  Terry Therneau
>
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