A note on the existence of maximum likel
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N. Le; L. Sun; J.V. Zidek
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Article
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1998
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Elsevier Science
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English
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We show that a non-identifiability problem can occur when one attempts to estimate the degrees of freedom and the unstructured covariance matrix simultaneously in a Gaussian-inverted Wishart model, using the maximum likelihood approach. However, the EM algorithm may falsely converge to give finite e