It means that Stata had trouble converging. Sometimes it is a data problem, like
high correlation among you explanatory variables, a categorical explanatory variable
with a virtually empty category, or an interaction term with such a categorical
variable. Anyhow, you need to resolve it before reporting your results.
HTH,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of naim cordemans
Sent: dinsdag 22 augustus 2006 11:13
To: [email protected]
Subject: st: Missing results in XTTOBIT regressions
What does it mean when results are missing and replaced by dots for some
variables in XTTOBIT regressions ?
Thanks a lot
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