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Re: st: error message after using -reoprob-


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: error message after using -reoprob-
Date   Sat, 24 May 2008 22:13:46 +0100 (BST)

--- "J. Li" <lij53@univmail.cis.mcmaster.ca> wrote:
> The third way seems most informative to this problem. I used regoprob
> with -pl- option instead of reoprob. It turned out to be that it
> stopped at the same place where reoprob couldn't run through, but
> using -regoprob- gives more informative error message. It said that
> "insufficient observations" when it died. I have a further question
> about this though-- what does this error message really mean? I am
> talking about using a panel data set with 3,960 observations (N=660,
> T=6) to estimate about 47 parameters in a random effects ordered
> probit model. Is the sample size too small here? Thanks!

This error message sometimes pops up when you have an explanatory
variable that perfectly predicts your dependent variable. Have a look
at the bivariate relations between your explanatory variables and your
dependent variable, for instance by using -tab-, and see if that is the
case. If that is the problem there is very little you can do other than
leave that variable out of your model (or get more data).

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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