If any of the programs fail to converge, then their estimates are unreliable and cannot be compared. Use of different initial values may lead to convergence. For instance, set the initialValues argument equal to 0 to uses all 0’s as starting values. Or set a vector with the correct number of elements.
rxLogit displays the condition number of the final variance-covariance matrix as an indicator of the numerical reliability of the results. It also will terminate estimation if the model is too ill-conditioned to yield reliable estimates.
Article ID: 3104288 - Last Review: Oct 29, 2015 - Revision: 1