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Mplus Discussion > Latent Variable Mixture Modeling >
 Eric Turkheimer posted on Thursday, June 14, 2018 - 6:53 am
I am trying to fit a two-class two level model in twin pairs. The twins are modeled with a known class, the other class is estimated. Any attempt to estimate different between level variances of Y results in the error in the subject line. I can't find anything about it online.

 Bengt O. Muthen posted on Thursday, June 14, 2018 - 5:07 pm
Answered by Support.
 mboer posted on Wednesday, November 13, 2019 - 7:50 am
Dear Prof. Muthen,

I encountered a similar problem and I was wondering how to solve it. I'm trying to model a two-level multiple group model using the KNOWNCLASS option. My model specification is as follows:

PSMU ON wave3 wave4;
PSMU ON wave3 wave4 (wb1 wb2);
PSMU (varw_boys);
PSMU ON wave3 wave4 (wb3 wb4);
PSMU (varw_girls);

PSMU ON prevoc native;
PSMU ON prevoc native (bb1 bb2);
PSMU (varb_boys);
PSMU ON prevoc native (bb3 bb4);
PSMU (varb_girls);

I would like to free the between-level variance of PSMU across the two classes, but then I get the same error as posted above. How can I solve this issue?

Thank you in advance.
 Bengt O. Muthen posted on Wednesday, November 13, 2019 - 11:53 am
We need to see your full output - send to along with your license number.
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