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 Sally Czaja posted on Wednesday, May 16, 2007 - 7:32 pm
Hi
I'm running an LCA with continuous indicators (like Ex. 7.9 in the User's Guide). I get an error message (at end) that refers to
PARAMETER SPECIFICATION FOR LATENT CLASS REGRESSION MODEL PART
ALPHA(C)
CLASS#1

What is this variable? where should I be looking in my model to correct this?
Thank you.
Sally

Error message:
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 -0.603D-17. PROBLEM INVOLVING PARAMETER 82.
 Linda K. Muthen posted on Wednesday, May 16, 2007 - 8:10 pm
You can see what parameter 82 is by asking for TECH1 in the OUTPUT command.
 Sally Czaja posted on Monday, May 21, 2007 - 1:35 pm
Parameter 82 is "alpha(c)". but I don't know what this means.
Thanks
Sally
 Linda K. Muthen posted on Monday, May 21, 2007 - 3:18 pm
It is a mean. If this does not help, please send your input, data, output, and license number to support@statmodel.com.
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