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st: RE: Missing results in XTTOBIT regressions

From   "Maarten Buis" <>
To   <>
Subject   st: RE: Missing results in XTTOBIT regressions
Date   Tue, 22 Aug 2006 11:21:08 +0200

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.


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

-----Original Message-----
From: []On Behalf Of naim cordemans
Sent: dinsdag 22 augustus 2006 11:13
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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