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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