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Nonlinear constraints for loading DIF |
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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 |
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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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