April 25, 2010
Hello to all,
I am very much new to OpenMx and still treading water over here. Specifically, I am having trouble fitting a multiple group CFA model to test various measurement invariance hypotheses. My main difficulty is that I cannot figure out how to specify my model so that the objective functions are combined across groups. I would be very grateful if someone could provide a very short script to fit a 2-group CFA model in RAM notation. Say, a 1-factor, three indicator model. No need to set equality constraints across groups -- I can handle that part. I just cannot figure out how to combine the objective functions with Ram specification. Any and all help very much appreciated. I am trying to move all of my class materials over the OpenMx.
Best, Niels
Niels Waller, Professor
Director of Quantitative/Psychometric Methods
Department of Psychology
N218 Elliott Hall
University of Minnesota
75 East River Road
Minneapolis Minnesota 55455
Phone: (612) 626-8729
Email: nwaller@umn.edu
Homepage: http://www.psych.umn.edu/faculty/waller/