I am running a 7-factor model using MLR in MGCFA comparing two groups (random order and standard order) on a 20-item measure. When I run the model, I receive the following warning message:
WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IN GROUP RANDOM IS NOT POSITIVE DEFINITE. THIS COULD INDICATE A NEGATIVE VARIANCE/ RESIDUAL VARIANCE FOR A LATENT VARIABLE, A CORRELATION GREATER OR EQUAL TO ONE BETWEEN TWO LATENT VARIABLES, OR A LINEAR DEPENDENCY AMONG MORE THAN TWO LATENT VARIABLES. CHECK THE TECH4 OUTPUT FOR MORE INFORMATION. PROBLEM INVOLVING VARIABLE EB.
I believe this might be a problem with the random order group because when I run the 7-factor model in the standard order group using CFA, I do not receive the error. However, when I run the 7-factor model in the random order group using CFA, I do receive the error message. Additionally, I checked all models for negative residuals, and there are none.