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The covariance matrix returned from Maxlik (or CML or CMLMT) is a missing value
1 Answer
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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.
