Covariance matrix not positive definite PreviousNext
Mplus Discussion > Structural Equation Modeling >
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 Jessica Larsen posted on Thursday, October 06, 2016 - 2:15 pm
Hi, I'm attempting to run a second order CFA to specify a latent variable I want to use as a mediator in a simple mediation model. I have the following error message:

"WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) 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 F1."

I notice that the STDYX factor loading for my F1 to my second order factor FC is over 1 (1.095 to be exact). Can someone please assist me in understanding what is going wrong with my model. Thanks!
 Bengt O. Muthen posted on Thursday, October 06, 2016 - 3:32 pm
This can happen when you have highly correlated factors.
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