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

[Sabah Abdullah]

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,

Sabah


Maximize; labels=alp,bet,d, e, f;
    ;start=0,0,0,0,0;
    ;fcn=list=d*TOTAL_EX+e*SEXRESP+f*NUMRMS|(YY*log(1-lgp(alp+bet*BHIGH))
    +YN*log(lgp(alp+bet*BHIGH))-(lgp(alp+bet*BINTL))
    +NY*log(lgp(alp+bet*BINTL))-(lgp(alp+bet*BLOW))
    +NN*log(lgp(alp+bet*BLOW)))$
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.