[Limdep Nlogit List] random effects tobit
Andreas Drichoutis
adrihout at aua.gr
Sat Jun 19 00:58:29 EST 2010
Hi all,
I'm trying to estimate a random effects tobit model.
When I run this syntax:
NAMELIST ; X=round2,round3,round4,round5,gender,age,student,edu,inc2,inc3,
lastmeal,bringlun,ham,hunger2,hunger3,hunger4,hunger5,hunger6,freqham2,freqh
am3,freqham4,
one,future,pm3,futxpm3 $
SKIP $
TOBIT ; Lhs=bid ; Rhs=X ; Pds=5 ; random effects
; marginal effects $
I get this error :
Error 143: Models - estimated variance matrix of estimates is singular
Error 447: Current estimated covariance matrix for slopes is singular.
If I replace ; Pds=5 with ; Pds=round, where round is the panel
variable, the model is estimated without the previous warning message.
The problem now is that I get marginal effects only for the first variable
of the model!! The rest of the output is somehow suppressed..
I then tried to add ; full to the above syntax only to get the warning:
Error 999: The specification ;FUL is not recognized.
Please help! I'm so frustrated..
PS. I didn't misspell "full"
Kind regards,
Andreas Drichoutis
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