Anonymous posted on Thursday, April 12, 2001 - 7:42 am
How do I test for factor pattern invariance over time in Mplus? I want to see if the two dimensional structure holds at two follow up time points. Each dimension is measured by 2-3 categorical indicators. Should I set it up in a SEM type of model with correlated errors over time? If so, how do I correlate errors in M-Plus?
You set it up as a CFA. Here is an example that gives the idea for 2 binary indicators at 2 time points, imposing invariant thresholds and loadings, while allowing scale factors to differ across time (see also User's Guide):
f1 BY y11 !first indicator loading is !fixed at one by default