Growth Mixture Modeling in R

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Presentation transcript:

Growth Mixture Modeling in R July 07, 2015

A Motivating Example

What approaches are available? Linear regression? Polynomial linear regression? Other ideas?

What is gmm?

SEM

Latent Class Growth Model

What is mixture-modeling?

Growth Mixture Model

Two methods of implementing GMM in R # http://openmx.psyc.virginia.edu/docs/OpenMx install.packages(‘OpenMx’) # http://cran.r-project.org/web/packages/lcmm/index.html install.packages(‘lcmm’)

OpenMx OpenMx allows considerable freedom.. -> Procedural vs. object-oriented styles. -> Equivalent models with different scripts.

lcmm lcmm is more limited, but.. -> Follows a more familiar syntax for specifying models in R -> Automatic plotting of outputs

Some references plotting longitudinal data getting classifications out of OpenMx

Nonparametric approach # http://cran.r-project.org/web/packages/kml3/index.html install.packages(‘kml’) #http://cran.r-project.org/web/packages/kml3d/index.html install.packaged(‘kml3d’)