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Mplus Discussion > Growth Modeling of Longitudinal Data >
 Michael Moore posted on Monday, September 10, 2012 - 5:27 pm
Hello all,

I was attempting to fit an LGM to data collected over 5 timepoints (grades 1, 3, 5, 6, and age 15). What is changing over time is one latent variables with three indicators (momdep, momang, & momanx). Abbreviated syntax is included below:

f1 BY momdepg3
momanxg3-momangg3 (1-2);
f2 BY momdepg5
momanxg5-momangg5 (1-2);
f3 BY momdepg6
momanxg6-momangg6 (1-2);
f4 BY momdep15
momanx15-momang15 (1-2);
[momdepg3 momdepg5 momdepg6 momdep15] (3);
[momanxg3 momanxg5 momanxg6 momanx15] (4);
[momangg3 momangg5 momangg6 momang15] (5);
i s | f1@0 f2@1 f3@2 f4@3;

The difficulty I am having is that I am getting the following error message:

*** ERROR in Model command
There are fewer equality labels given than there are parameters.
Please check the statement with the following equalities.
Equality: 1-2

Any idea what I'm doing wrong? Thanks for your help!
 Bengt O. Muthen posted on Monday, September 10, 2012 - 7:42 pm
A list such as

momanxg3-momangg3 (1-2);

contains more than 2 variables in your case. Check the USEV list.
 Michael Moore posted on Monday, September 10, 2012 - 8:17 pm
I tried rewriting the syntax so it read:

f1 BY momdepg3
momanxg3 momangg3 (1-2);

...but I ran into the same problem. I want to equalize the factor loadings across time (so the loadings for momangg3, momangg5, momangg6, and momang15 are equivalent and the loadings for momanxg3, momanxg5, momanxg6, and momanx15 are equivalent). Is there a better way that I can go about this? Should I add:

[momangg3 momangg5 momangg6 momang15](1);
[momanxg3 momanxg5 momanxg6 momanx15](2);

 Bengt O. Muthen posted on Monday, September 10, 2012 - 8:25 pm
To help you, we need to see your full output. Send your original run to Support along with your license number.
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