Dear Users and Maintainers,

Have you used OpenMx to fit Factor Mixture Models (FMM)? I saw that feature in Mplus but I couldn't figure out whether OpenMx can do it or not. Hence the question. Guidance on how to fit FMM using OpenMx would be much appreciated.

Yeah, I bet OpenMx can do it. Is there a specific model from the Mplus user guide that you'd like to see translated into OpenMx?

Here's an example Growth Mixture Model. A growth mixture model is a factor mixture model with fixed factor loadings. It's probably easy enough to modify this script to freely estimate the loadings.

The latest version of the demo script is run-able with

Here' the code for inspection.

Note that you could scale the mixture proportions differently if you want. See the

`scale`

argument of`?mxExpectationMixture`

for details. Many other software packages only allow "multinomial logisitc regression" or what we call "softmax" scaling.