Problem with constraints PreviousNext
Mplus Discussion > Latent Variable Mixture Modeling >
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 Guillaume Filteau posted on Thursday, October 02, 2008 - 12:02 am
Hello all.

I believe I have a problem using constraints.

For example, if I use

....
MODEL:
%class#1%
[x] (p1);
%class#2%
[x] (p2);
%class#3%;
[x]
MODEL CONSTRAINT:
p1 - p2 = 10;
...

The model acts as if I had put the constraint "p2 = 10;", instead of "p1 - p2 = 10;"

Also, if I use this to set the proportion of class 1

...
Model:
%overall%
[class#1@0.5];
...

I find out that the constraint is not on the proportion of class 1, but on the "Categorical Latent Variables Mean" of class 1.
 Linda K. Muthen posted on Thursday, October 02, 2008 - 10:01 am
You should restate the constraint as:

p1 = p2 + 10;

The value should be a logit.
 Guillaume Filteau posted on Friday, October 03, 2008 - 7:53 am
Thank you, professor Muthen!
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