[Limdep Nlogit List] The Latent Class Ordered Choice model estimation
Simona Rasciute
S.Rasciute at lboro.ac.uk
Fri May 15 20:38:02 EST 2009
Dear All,
I am trying to estimate the Latent Class Ordered choice model and I would appreciate your comments on the following issue.
When the model is estimated the following error is reported:
Initial iterations cannot improve function.Status=3
Error 805: Initial iterations cannot improve function.Status=3
Function= .10932395206D+06, at entry, .16597492911D+06 at exit
The dependent variable has 10 categories. I am aware that the latent class estimator is unable to resolve more than one class with nice threshold parameters. Therefore, I have experimented with combining the categories. The simplest model that has been estimates is with 3 categories and 2 latent classes. The strangest thing is that initially none of the specifications worked, even if I included explanatory variables one by one. I have also tried different algorithms and number of iterations. This morning, however, the first estimation worked but afterwards identical estimation reported the same error above.
Here is the syntax used:
ordered ;lhs = depvar
;rhs = List of independent variables
;LCM = with or without class membership variables
;pts=2
;alg=bhhh$ also other algorithms have been used
The data have also been carefully checked.
Thank you very much in advance.
Regards,
Simona
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