What are the commands to compare two Chi-square fits of two SEM models?

[Stephen Bowman]

What are the commands to compare two Chi-square fits of two SEM models? Thanks!

[Richard Williams]

You probably want to use lrtest. Something like

sem ...
estimates store m1
sem ...
estimates store m2
lrtest m1 m2, stats

You can use lrtest for all sorts of things like this, e.g. compare two logit models. The assumption is that the models are nested. Also, the model has to generate a LR chi-square. If, say, you were using the svy: prefix, you would get Wald chi-squares which cannot be compared in this way.