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Re: st: goodness of fit measure fir ivtobit


From   "Anat (Manes) Tchetchik" <anatmanes@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: goodness of fit measure fir ivtobit
Date   Mon, 24 Sep 2012 17:51:06 +0300

Yuval Hey,
I ran the ivtobit with Newey's two step estimator which is not a
maxiumum likelihood.
The chi-sq. stat. is highly significant, and trying what Austin
Nichols has suggested
(http://www.stata.com/support/faqs/statistics/r-squared/) resulted
with R2 of 0.12 which is not that bad for my kind og data.
so I guess I can "live" with the results.
Thanks Much and Best regards,
Anat

On Sun, Sep 23, 2012 at 5:09 AM, Yuval Arbel <yuval.arbel@gmail.com> wrote:
> Anat,
>
> I checked the -ereturn list- for -ivtobit- and indeed (and unlike
> regular tobit) there is no pseudo R-squared measure. If you would
> still like to compare between models, you can use the log-likelihood,
> which is often available in stata outputs, as a simple measure. You
> also have a chi-square statistics for exogeneity testing, which seems
> to me more important than a goodness of fit measure.
>
> Finally, note that in many occasions the goodness of fit measures in
> these models are quite low (particularly if you have many missing
> values in the dependent variables)
>
>
>
> On Sun, Sep 23, 2012 at 3:26 AM, Yuval Arbel <yuval.arbel@gmail.com> wrote:
>> Hi Anat,
>>
>> As the first step, I would suggest to use the -ereturn list- command
>> to see the full stata output available after -ivtobit-
>>
>> On Sat, Sep 22, 2012 at 11:33 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..
>>> Best,
>>>
>>> --
>>> Anat Tchetchik, PhD
>>> Department of Hotel and Tourism Management
>>> Guilford Glazer Faculty of Business and Management
>>> Ben-Gurion University of the Negev
>>> P.O.Box: 653
>>> Beer-Sheva, Israel, 84105
>>>
>>> E-mail:       anat@som.bgu.ac.il
>>> Phone         972-(0)8-6479735
>>> Fax:           972-(0)8-6472920
>>> Web:          http://cmsprod.bgu.ac.il/Eng/som/hotelmanage/Staff/Academic/ChechikA.htm
>>> *
>>> *   For searches and help try:
>>> *   http://www.stata.com/help.cgi?search
>>> *   http://www.stata.com/support/statalist/faq
>>> *   http://www.ats.ucla.edu/stat/stata/
>>
>>
>>
>> --
>> Dr. Yuval Arbel
>> School of Business
>> Carmel Academic Center
>> 4 Shaar Palmer Street,
>> Haifa 33031, Israel
>> e-mail1: yuval.arbel@carmel.ac.il
>> e-mail2: yuval.arbel@gmail.com
>
>
>
> --
> Dr. Yuval Arbel
> School of Business
> Carmel Academic Center
> 4 Shaar Palmer Street,
> Haifa 33031, Israel
> e-mail1: yuval.arbel@carmel.ac.il
> e-mail2: yuval.arbel@gmail.com
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/



-- 
Anat Tchetchik, PhD
Department of Hotel and Tourism Management
Guilford Glazer Faculty of Business and Management
Ben-Gurion University of the Negev
P.O.Box: 653
Beer-Sheva, Israel, 84105

E-mail:       anat@som.bgu.ac.il
Phone         972-(0)8-6479735
Fax:           972-(0)8-6472920
Web:          http://cmsprod.bgu.ac.il/Eng/som/hotelmanage/Staff/Academic/ChechikA.htm
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


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