http://www.aptech.com Fri, 08 Feb 2013 19:12:28 +0000 en-US hourly 1 http://wordpress.org/?v=3.4.1 http://www.aptech.com/questions/the-covariance-matrix-returned-from-maxlik-or-cml-or-cmlmt-is-a-missing-value/#answer-1272 http://www.aptech.com/questions/the-covariance-matrix-returned-from-maxlik-or-cml-or-cmlmt-is-a-missing-value/#answer-1272#comments Fri, 31 Aug 2012 08:43:37 +0000 admin http://www.aptech.com/questions/the-covariance-matrix-returned-from-maxlik-or-cml-or-cmlmt-is-a-missing-value/#answer-1272 Continue reading →]]> If the covariance matrix is a scalar missing value and the “Hessian Calculation failed” message is issued, the calculated Hessian has failed to invert.  This means it contains linear dependencies. These dependencies can be due to poor scaling of the data, catastrophic failure of precision, or unidentified parameters in your model.

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