Not positive definite error message PreviousNext
Mplus Discussion > Confirmatory Factor Analysis >
 Metin Ozdemir posted on Saturday, January 24, 2009 - 5:02 pm
I am running a measurement model with six latent variables, two of which are second order factors.

I have been receiving "PSI matrix not positive definite" error. I have checked residual variances, none is negative. The latent variable correlations are not over one. I checked the data file, the is no problem with reading the data file.

What may be other reasons, and how can I solve this problem?


Metin Ozdemir
 Bengt O. Muthen posted on Saturday, January 24, 2009 - 5:50 pm
The factor covariance matrix may be not pos def due to the combination of correlations among several latent variables - none has to be greater than 1. This suggests a misspecified model. I would break down the model and analyze its smaller parts to see where the problem occurs.
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