I would like to know if I can test for group differences in SEM (as I can in growth curve modeling by constraining the intercepts and slopes across groups) by using constrains. If so, what are the parameters I would need to constrain?
Yes, you can do this. You would constrain the parameters you are interested in testing. The multiple group section of the Topic 1 course handout shows examples of testing means, variances, and covariances of factor across groups.
Nina Wu posted on Wednesday, May 02, 2012 - 6:35 pm
Thank you very much for your previous response, Dr. Muthen.
In growth curve modeling, I would constrain the intercepts and slopes across groups. May I ask what parameters I would need to constrain across groups in SEM?
a typical constrain statement in growth curve is:
model: [i] (1); [s] (2)
however, in SEM the model estimates the paths, not parameters such as intercept and slope. May I ask what is/are typical parameters that researchers constrain and how I would go about doing that?