# A CLASSICAL INVARIANCE APPROACH TO THE NORMAL MIXTURE PROBLEM

@article{Ranalli2020ACI, title={A CLASSICAL INVARIANCE APPROACH TO THE NORMAL MIXTURE PROBLEM}, author={Monia Ranalli and Bruce G. Lindsay and David R. Hunter}, journal={Statistica Sinica}, year={2020} }

Although normal mixture models have received great attention and are commonly used in different fields, they stand out for failing to have a finite maximum on the likelihood. In the univariate case, there are n solutions, corresponding to n distinct data points, along a parameter boundary, each with an infinite spike of the likelihood, and none making particular sense as a chosen solution. The multivariate case yields an even more complex likelihood surface. In this paper, we show that there is…

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