[Limdep Nlogit List] Re: Follow up on DB DC

Sabah Abdullah sabouha2 at gmail.com
Fri Nov 30 10:54:16 EST 2007

Dear Limdep listservers:

I ran the double bounded dichotomous choice (DB DC) using the bids
successfuly but when I added the socio-economic variables, I received
the following error (see below). I have checked to see if there are
collinearity problems but so far none. Any other suggestions?

Best wishes,


Maximize; labels=alp,bet,d, e, f;
Normal exit from iterations. Exit status=0.
Error:   143: Models - estimated variance matrix of estimates is singular
Error:   447: Current estimated covariance matrix for slopes is singular.

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