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Entropy 2011, 13(10), 1746-1764; doi:10.3390/e13101746
Article

Projective Power Entropy and Maximum Tsallis Entropy Distributions

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Received: 26 July 2011 / Revised: 20 September 2011 / Accepted: 20 September 2011 / Published: 26 September 2011
(This article belongs to the Special Issue Tsallis Entropy)
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Abstract

We discuss a one-parameter family of generalized cross entropy between two distributions with the power index, called the projective power entropy. The cross entropy is essentially reduced to the Tsallis entropy if two distributions are taken to be equal. Statistical and probabilistic properties associated with the projective power entropy are extensively investigated including a characterization problem of which conditions uniquely determine the projective power entropy up to the power index. A close relation of the entropy with the Lebesgue space Lp and the dual Lq is explored, in which the escort distribution associates with an interesting property. When we consider maximum Tsallis entropy distributions under the constraints of the mean vector and variance matrix, the model becomes a multivariate q-Gaussian model with elliptical contours, including a Gaussian and t-distribution model. We discuss the statistical estimation by minimization of the empirical loss associated with the projective power entropy. It is shown that the minimum loss estimator for the mean vector and variance matrix under the maximum entropy model are the sample mean vector and the sample variance matrix. The escort distribution of the maximum entropy distribution plays the key role for the derivation.
Keywords: elliptical contoured distribution; escort distribution; Lp space; maximum entropy distribution; statistical distribution; Tsallis entropy elliptical contoured distribution; escort distribution; Lp space; maximum entropy distribution; statistical distribution; Tsallis entropy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Eguchi, S.; Komori, O.; Kato, S. Projective Power Entropy and Maximum Tsallis Entropy Distributions. Entropy 2011, 13, 1746-1764.

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