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.