Procedure for parallel process GMM PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
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 SF Wang posted on Wednesday, September 25, 2013 - 6:53 pm
Dear Professors,

I have read from multiple threads that you recommend fitting individual processes before fitting parallel process GMM. I was wondering what information we could get from individual ones for the parallel modelling. Do the individual ones determine whether parallel process is appropriate?

Could you recommend some readings/publications about this?

Thanks a lot.

Shufang
 Linda K. Muthen posted on Wednesday, September 25, 2013 - 9:35 pm
Looking at each process separately allows you to see if the process fits that data with no problems. I don't know of any readings.
 SF Wang posted on Thursday, September 26, 2013 - 12:57 pm
Could you talk more about this topic? What are the scenarios that parallel process does not fit the data well? for example, if individual process and parallel one differ a lot, does it indicate that parallel process does not fit the data? ......
 Linda K. Muthen posted on Thursday, September 26, 2013 - 4:24 pm
If the individual process models fit well and the parallel process model does not, it is misspecified in some way. One possibility is that you may need residual covariances across processes at each time point.
 SF Wang posted on Tuesday, October 01, 2013 - 6:51 pm
Thank you very much for your response.

Do you have any example code for setting residual covariances across processes at each time point? If not, could you give a simple example, using the following setting? For example, I have 4 time points, how should we specify residual covariance for %c#1%?

MODEL:
%OVERALL%
yi ys yq | Y0@0 Y1@1 Y2@2 Y3@3;
zi zs zq | Z0@0 Z1@1 Z2@2 Z3@3;

%c#1%
!?????

Thank you very much!

Shufang
 Linda K. Muthen posted on Tuesday, October 01, 2013 - 7:35 pm
Put in the overall part of the MODEL command:

y0 WITH z0;
y1 WITH z1;
etc.
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