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Re: st: goodness of fit measure fir ivtobit


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: goodness of fit measure fir ivtobit
Date   Sat, 22 Sep 2012 22:49:29 -0400

Anat (Manes) Tchetchik <anatmanes@gmail.com>:
You can always -predict- and compute the squared correlation of
predictions with observed values:
http://www.stata.com/support/faqs/statistics/r-squared/
but are you sure your -ivtobit- model is justified?  What is the
process that results in observations being censored?  I suspect you
have a lower limit at zero which is actually a very low conditional
mean rounded down to zero--am I right?  You may be better off with a
-gmm- model.

On Sat, Sep 22, 2012 at 5:33 PM, Anat (Manes) Tchetchik
<anatmanes@gmail.com> wrote:
> Dear statalisters,
>
> I wonder if anyone knows any goodness of fit that is appropriate for
> tobit with endogenous
> variables (ivtobit). Not as in "regular" tobit, stata does not report any
> goodness of fit measure, any idea how to estimate such a measure?
> Any response will be greatly appreciated..
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