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st: probit questions


From   "Sun, Yan (IFPRI)" <Y.SUN@CGIAR.ORG>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: probit questions
Date   Wed, 25 Jun 2008 10:51:52 -0400

Dear Statalist,

I have couple of questions about the Probit model. My dependent variable
is a 0/1 binary choice (1=invest in technology, 0=no investment) for
user groups, independent variables are user groups' characteristics
(around 20).
1) Which model is correct one: Probit or Logit? What is the STATA
command for checking this?
2) I have small observations (total 170 observations, but valid obs. Is
only around 60 for all independent variables), sometimes the regression
does not report report "wald chi2" statistics. What is the reason for
this?
3) I got a note after right after the regression, which says "8 failures
and 7 successes completely determined", what does this means?

Thank you very much.

Yan Sun
Int'l Food Policy Res. Institute

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