[EMAIL PROTECTED] (Eric Bohlman) wrote in message
news:<a5o5b1$fi0$[EMAIL PROTECTED]>...
> Rolf Dalin <[EMAIL PROTECTED]> wrote:
>
> IIRC, your example is exactly the sort of situation for which Tobit
> modelling was invented.
Considered that (actually estimated a couple of Tobit models and if I
use a log transformed or box-cox transformed response the results are
consistent with the ordinal logit I originally described) but Tobt
assumes a normally distributed censored response -- the observed
distribution for the non-zero responses is not approximately normal
(even with transformations) and I don't think it's reasonable to
assume the errors are generated by an underlying gaussian process. My
understanding of the Tobit model is that it's not especially robust to
violations of the this assumption.
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