Comparing within-subjects coefficients PreviousNext
Mplus Discussion > Structural Equation Modeling >
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 Ali H. posted on Wednesday, February 08, 2017 - 9:01 am
Hello,

How would you perform a within-subject comparison in SEM?

Let's say that I want to examine the regression path from IQ to Grades in 3 school subjects (math, English, sports). And let's say that I expect the coefficient to be stronger between IQ and math, and weaker between IQ and sports. How can I test this?

I can't use multiple-group SEM here because I don't have different groups. My data comes from one group only. Is there a special feature in Mplus to compare two coefficients (or a formula that I can use)? Thanks!
 Bengt O. Muthen posted on Wednesday, February 08, 2017 - 3:55 pm
Just label the 2 slopes b1 and b2 in the Model command and then use

Model Constraint:
New(diff);
diff = b1-b2;
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