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Mplus Discussion > Growth Modeling of Longitudinal Data >
 Anonymous posted on Tuesday, February 22, 2005 - 7:37 am
Hello Bengt and Linda,

I know the coding must be a simple extrapolate of some of the examples in the Mplus 3 User's Guide, but I am having difficulty finding the particular model contraints to use for the following model. I have a randomized clinical trial with 2 groups, measures over 4+ time points (depending on the DV). I am seeking to compare ONLY the latent mean of the slope for the two groups. I have not, however, seen the process for freeing everything else and constraining a latent mean in LGM. Any help would be much appreciated.


 Linda K. Muthen posted on Saturday, February 26, 2005 - 4:31 pm
I assume that you are talking about the mean of the slope growth factor. I am assuming that your outcome is continuous. In a growth model, the mean of the slope growth factor is free across groups as the default. Following is how the model is specified so that the mean of the slope growth factor is constrained to be equal across groups.

i s | y1@0 y2@1 y3@2 y4@3;
[s] (1);
 Anonymous posted on Monday, February 28, 2005 - 8:22 am
Excellent - thanks!
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