Piecewise GMM vs General GMM PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
 Richa Mary Ghevarghese posted on Monday, July 08, 2019 - 9:28 am

I'm looking to understand what the key (technical & conceptual) differences are between the piecewise GMM and the general GMM.

From my reading, I have gathered that the piecewise GMM permits the researcher to estimate the unknown number of latent classes with individually varying timepoints of transition compared to the general GMM which estimates latent classes from development phase to the next development phase.

This said, I'm still not clear on why anyone would use the general GMM, when it seems like the piecewise GMM offers increased accuracy in estimating and establishing functional forms.
 Bengt O. Muthen posted on Sunday, July 14, 2019 - 11:49 am
Piecewise modeling is less parsimonious, might make the interpretation of the growth factors less clear, and may get a worse BIC.
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