Gmm and starting values PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
 cathy labrish posted on Thursday, June 18, 2015 - 10:48 am
Hello (and in advance thanks for your help).

I am fitting a GMM in which I allow my covariance matrices (residual and latent variable) to vary across classes (although the residual structure is assumed homogeneous across the classes). I specify random starts of course, but supply user-defined starting values for all estimated parameters. I understand how MPLUS varies the values for the latent class means, but am unclear as to how it varies the values for all other parameters. Could you a) point me to a reference that explains how Mplus accomplishes this and b) if not, then perhaps briefly describe the process for me? Note, the model recovers no more than two viable classes (which is what it should do!).
 Bengt O. Muthen posted on Thursday, June 18, 2015 - 12:06 pm
I think you are asking about the random perturbations of the starting values. We have described random starts in the Random Starts technical appendix on web page:
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