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st: RE: probit questions


From   "Martin Weiss" <martin.weiss@uni-tuebingen.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: probit questions
Date   Wed, 25 Jun 2008 17:41:01 +0200

The choice won´t make much of a difference:

**********
webuse union, clear

probit union age grade not_smsa south southXt
predict predprob

logit union age grade not_smsa south southXt
predict predlog

compare predprob predlog

scatter  predprob predlog
**********

Martin Weiss
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Diplom-Kaufmann Martin Weiss
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-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Sun, Yan (IFPRI)
Sent: Wednesday, June 25, 2008 4:52 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: probit questions

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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