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Mplus Discussion > Structural Equation Modeling >
 S.Arunachalam posted on Thursday, June 28, 2012 - 11:03 am
Hello Prof. Muthen

A clarification on usage of Model Test in multi-group analysis.I have two groups, and trying to check if the regression parameter with label a is equal to parameter b.

When I ran the code
Model test:
a = b
wald-chi sq test is non-significant
Wald Test of Parameter Constraints
Value 0.981
Degrees of Freedom 1
P-Value 0.3219

However if use
Model test:
a - b = 0

the results are
Wald Test of Parameter Constraints
Value 7.280
Degrees of Freedom 1
P-Value 0.0070

I thought in both ways am testing the same difference in parameter test. Please help
 Eric Deemer posted on Friday, July 18, 2014 - 1:08 pm
I have a question similar to the previous poster. I'm doing a multiple group analysis and I want to test the noninvariance of a particular path coefficient. Do I need to label the coefficient in the overall model command? My input is below:

MODEL: st BY svs1-svs8;
scientid by atmr sdcr sciid;
tapp BY newagq1 newagq4 newagq7;
sapp by newagq2 newagq5 newagq8;

tapp on scientid st;
sapp on scientid st;
scientid on st;

tapp ind scientid st;
sapp ind scientid st;

Model other:
scientid on st(a);
Model science:
scientid on st(b);

Model test:

 Bengt O. Muthen posted on Friday, July 18, 2014 - 4:13 pm
The way you label them is correct. Model test should have

0 = a-b;
 Eric Deemer posted on Friday, July 18, 2014 - 4:37 pm
Thanks so much, Bengt.

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