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From ε-Entropy to KL-Entropy: Analysis of Minimum Information Complexity Density Estimation

Tong Zhang
The Annals of Statistics
Vol. 34, No. 5 (Oct., 2006), pp. 2180-2210
Stable URL: http://www.jstor.org/stable/25463505
Page Count: 31
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From ε-Entropy to KL-Entropy: Analysis of Minimum Information Complexity Density Estimation
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Abstract

We consider an extension of ε-entropy to a KL-divergence based complexity measure for randomized density estimation methods. Based on this extension, we develop a general information-theoretical inequality that measures the statistical complexity of some deterministic and randomized density estimators. Consequences of the new inequality will be presented. In particular, we show that this technique can lead to improvements of some classical results concerning the convergence of minimum description length and Bayesian posterior distributions. Moreover, we are able to derive clean finite-sample convergence bounds that are not obtainable using previous approaches.

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