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.