Dear Mark,
Thank you. My apologies for making you point out such a clear error. I
was struck by the cut and paste bandit.
If I remove "robust", I no longer receive the not positive definite message.
Cordially,
Alexandra
--
Alexandra Guisinger
Assistant Professor
Political Science
University of Notre Dame
217 O'Shaughnessy Hall
Notre Dame, IN 46556
(574) 631-3846
[email protected]
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