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st: RE: Missing results in XTTOBIT regressions


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
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.

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: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of naim cordemans
Sent: dinsdag 22 augustus 2006 11:13
To: statalist@hsphsun2.harvard.edu
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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