Nonlinear constraints for loading DIF PreviousNext
Mplus Discussion > Confirmatory Factor Analysis >
Message/Author
 Jennifer Rose posted on Monday, January 11, 2010 - 5:14 pm
Hi,

I've heard that it is possible to test factor loading DIF in a binary CFA using nonlinear constraints. However, when I try to run the following code where lam1 is the parameter label for the factor loading and daily is the observed moderator:

model constraint:
new(difl);
difl=lam1*daily;

I get an error message *** FATAL ERROR
THIS PARAMETER RESTRICTION MODEL IS NOT AVAILABLE. Does this mean that it is not possible to test factor loading DIF this way in Mplus or am I just specifying the DIF parameter incorrectly? I know I can use multiple group CFA to test this DIF but my goal is to ultimately test DIF for a model with 2 moderators (the binary daily variable above and another continuous variable).

Thanks,
Jen
 Linda K. Muthen posted on Tuesday, January 12, 2010 - 3:22 pm
The current version of Mplus cannot have a combination of ALGORITHM=INTEGRATION and the CONSTRAINT option of the VARIABLE command. You would need to use multiple groups.
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