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sem 3 3.pdf [6] | 7.57 KB |

kat test.r [7] | 6.63 KB |

Hello everybody,

I try to do a Monte Carlo simulation with a very simple SEM. I've got 2 latent variables and 3 categorical indicators with 3 categories per latent variable (see the attachment).

If I run my model (code is also in the attachment) I receive different error messages:

-"In model 'Title' NPSOL returned a non-zero status code 1. The final iterate satisfies the optimality conditions to the accuracy requested..."

-"In model 'Title' NPSOL returned a non-zero status code 6. The model does not satisfy the first-order optimality conditions..."

And in a very few case I don't receive an error message.

I read that the choice of the starting values can solve the problem, so I choose them near the "true" values but the problem still remains.

I also read that underidentification of the model could be the problem, but I fixed the variances of the error terms of the observed variables to 1 ,the means to 0 and one loading of each block to 1, so I think the model should be identified.

I would appreciate any suggestion and/or possible solutions.

Florian