Two-part growth model PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
Message/Author
 Steven Haas posted on Tuesday, February 12, 2008 - 2:41 pm
I am attempting to estimate a two-part growth model with 25 observation points for each case (annual labor earnings observations).

I can't seem to get the model to converge. Below are the error messages.

THE MODEL ESTIMATION DID NOT TERMINATE NORMALLY DUE TO AN ILL-CONDITIONED
FISHER INFORMATION MATRIX. CHANGE YOUR MODEL AND/OR STARTING VALUES.

THE MODEL ESTIMATION DID NOT TERMINATE NORMALLY DUE TO A NON-POSITIVE
DEFINITE FISHER INFORMATION MATRIX. THIS MAY BE DUE TO THE STARTING VALUES
BUT MAY ALSO BE AN INDICATION OF MODEL NONIDENTIFICATION. THE CONDITION
NUMBER IS 0.683D-11.

THE STANDARD ERRORS OF THE MODEL PARAMETER ESTIMATES COULD NOT BE
COMPUTED. THIS IS OFTEN DUE TO THE STARTING VALUES BUT MAY ALSO BE
AN INDICATION OF MODEL NONIDENTIFICATION. CHANGE YOUR MODEL AND/OR
STARTING VALUES. PROBLEM INVOLVING PARAMETER 41.


Is there a maximum number of observations per case that Mplus can handle for these types of models?
 Linda K. Muthen posted on Tuesday, February 12, 2008 - 3:39 pm
Please send your input, data, output, and license number to support@statmodel.com. The problem would not be due to 25 observation points.
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