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EM algorithm and variants: an informal tutorial

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arxiv 1105.1476 v2 pith:VBRO5X7H submitted 2011-05-07 stat.CO

classification stat.CO
keywords algorithminformalvariantsbehindbeyondcurrentdempsterdiscovered
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The expectation-maximization (EM) algorithm introduced by Dempster et al in 1977 is a very general method to solve maximum likelihood estimation problems. In this informal report, we review the theory behind EM as well as a number of EM variants, suggesting that beyond the current state of the art is an even much wider territory still to be discovered.

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