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 Andreas Richter posted on Wednesday, June 16, 2010 - 3:51 pm
Dear Mplus team,
I'm running a MGA to establish invariance of a ML model of 177 individuals nested in 34 teams, and the two groups are US and Europe - the model doesn't run, and I get the below message: THE MODEL ESTIMATION DID NOT TERMINATE NORMALLY DUE TO AN ILL-CONDITIONED FISHER INFORMATION MATRIX. CHANGE YOUR MODEL AND/OR STARTING VALUES.
I have already tried setting the very low between-level variances@0, but no success. The error message continues telling me: THE STANDARD ERRORS OF THE MODEL PARAMETER ESTIMATES COULD NOT BE COMPUTED.
Any advice would be much appreciated.
 Linda K. Muthen posted on Wednesday, June 16, 2010 - 6:01 pm
As a first step,I would try each group separately. If you continue to have problems, send the appropriate files and your license number to support@statmodel.com.
 Andreas Richter posted on Thursday, June 17, 2010 - 11:27 am
Thank you Prof Muthen. This particular model runs for the European group separately (24 teams, 129 individuals), but NOT for the US group separately (10 teams, 48 individuals).
(With a modified models using item parceling, it is the other way around)
 Linda K. Muthen posted on Thursday, June 17, 2010 - 4:28 pm
I don't know how many parameters your model has, but 48 individuals in 10 clusters is quite small. It is recommended to have a minimum of 30 clusters. Note also that if the same model does not fit well in each group, comparisons across groups are not valid.
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