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
_________________________________________________________________
Diplom-Kaufmann Martin Weiss
Mohlstrasse 36
Room 415
72074 Tuebingen
Germany
Fon: 0049-7071-2978184
Home: http://www.wiwi.uni-tuebingen.de/cms/index.php?id=1130
Publications: http://www.wiwi.uni-tuebingen.de/cms/index.php?id=1131
SSRN: http://papers.ssrn.com/sol3/cf_dev/AbsByAuth.cfm?per_id=669945
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Sun, Yan (IFPRI)
Sent: Wednesday, June 25, 2008 4:52 PM
To: [email protected]
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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