Error message about untrustworthy sta... PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
Message/Author
 sunny shi posted on Thursday, May 14, 2009 - 2:16 pm
Dear Mplus,
When I was running a linear growth model with a correlated within-person residual covariance structure, I got the following error message:

THE MODEL ESTIMATION TERMINATED NORMALLY

THE STANDARD ERRORS OF THE MODEL PARAMETER ESTIMATES MAY NOT
BE TRUSTWORTHY FOR SOME PARAMETERS DUE TO A NON-POSITIVE DEFINITE
FIRST-ORDER DERIVATIVE PRODUCT MATRIX. THIS MAY BE DUE TO THE
STARTING VALUES BUT MAY ALSO BE AN INDICATION OF MODEL
NONIDENTIFICATION. THE CONDITION NUMBER IS 0.990D-12.
PROBLEM INVOLVING PARAMETER 14.

As the default method is ML, the information matrix is observed. However, I am wondering what causes the untrustworthy standard errors? What the untrustworthy comes from? Should I delete all these untrustworthy results? ( I am running 1000 replications)

Thanks for your reply!

Best Wishes
sunny shi
 Linda K. Muthen posted on Thursday, May 14, 2009 - 4:32 pm
You should send the full output and your license number to support@statmodel.com so we can see why this message occurs.
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