Heckprob is not appropriate in my case. Heckprob would treat the pile of
zeros i have as unobserved whereas the Tobit treats them as observed
zeros. This is the case in my data and therefore heckprob is not an
appropriate model. I could run a first stage Probit then a second stage
Tobit. However, the Tobit in the second stage does not use all the data
observed and hence the standard errors will not be correct leading to
wrong t statistics and be unable to interpret the results.
Kirimi
Martin Weiss wrote:
<>
Have you looked into
*************
help heckprob
*************
?
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Kirimi Sindi
Gesendet: Mittwoch, 25. Februar 2009 17:43
An: [email protected]
Betreff: st: double hurdle model with Tobit second stage estimation
Hey,
I working on a double hurdle model. The first stage is a Probit model
and the second stage is Tobit due to pile up of zeros. Is there a do
program that can assist me in this procedure to get the correct standard
errors accounting for the first stage estimation?
Thank you,
Kirimi
--
*******************************
Imagination is more important than knowledge.
For while knowledge defines all we currently know and understand,
imagination points to all we might yet discover and create.
*******************************
Kirimi Sindi
PhD Candidate
Department of Agricultural,
Food, and Resource Economics
Room 20 Cook Hall
Michigan State University
East Lansing, MI 48824
Telephone: +1-517-353-5320
Home Tel : +1-517-355-8151
Fax: +1-517-432-1800
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