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Mplus Discussion > Structural Equation Modeling >
 Rebecca Lacey posted on Tuesday, April 05, 2011 - 2:49 pm

I am running a path analysis model which has two broad groups of pathways - material and relational. I am using MODEL CONSTRAINT in order to assess which is most important. But I get an error message which says the following:

Unknown parameter label in MODEL CONSTRAINT: M1

The relevant part of the input is as follows:

Model indirect:
mal5cat IND sclass hqual terdisad sep (m1);
mal5cat IND sclass hqual sep (m2);
mal5cat IND tenureb hqual sep (m3);
mal5cat IND tenureb terdisad sep (m4);
mal5cat IND hqual terdisad sep (m4);
mal5cat IND hqual sep (m5);

mal5cat IND parstat sep (r1);
mal5cat IND parstat poorrel sep (r2);
mal5cat IND parstat peerrel sep (r3);
mal5cat IND poorrel sep (r4);

Model constraint:
0 = (m1*m2*m3*m4*m5) - (r1*r2*r3*r4);

Perhaps you can see why this does not work? Thanks.
 Linda K. Muthen posted on Tuesday, April 05, 2011 - 3:35 pm
Labels are given only in the MODEL command not in MODEL INDIRECT. You must label the parts of the indirect effect in the MODEL command and create a new parameter in MODEL CONSTRAINT that is the indirect effect and then proceed with the rest of the specifications.
 Rebecca Lacey posted on Wednesday, April 06, 2011 - 9:31 am
Okay, thanks very much for your help!
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