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arXiv 2112.03217math.STmath.PRstat.TH
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Dirichlet核密度估计的Minimax性质

Minimax properties of Dirichlet kernel density estimators

Karine Bertin, Christian Genest, Nicolas Klutchnikoff, Frédéric Ouimet

摘要:

本文研究了由Aitchison和Lauder(1985)提出的用于成分数据分析的Dirichlet核密度估计在$β$空间中的渐近性态,以及在$L^p$损失下的渐近性态.在最近的工作中,Ouimet和Tolosana-Delgado(2022)建立了该估计量的一致强相合性和渐近正态性。作为补充,它在这里示出的Aitchison-Lauder估计可以实现极小极大速率渐近为一个合适的选择的带宽时,$(p,β) \in [1, 3) \times (0, 2]$或$(p, β) \in \mathcal{A}_d$,其中$\mathcal{A}_d$是一个特定的子集的$[3, 4) \times (0, 2]$,取决于维度$d$的Dirichlet内核。同时也证明了当$p \in [4, \infty)$或$β\in (2, \infty)$都满足时,该估计量不可能是极小极大的.这些结果扩展到多变量的情况下,也纠正了Bertin和Klutchnikoff(2011)关于Beta核估计的极大极小性质的早期发现。

英文摘要:

This paper considers the asymptotic behavior in $β$-Hölder spaces, and under $L^p$ losses, of a Dirichlet kernel density estimator proposed by Aitchison and Lauder (1985) for the analysis of compositional data. In recent work, Ouimet and Tolosana-Delgado (2022) established the uniform strong consistency and asymptotic normality of this estimator. As a complement, it is shown here that the Aitchison-Lauder estimator can achieve the minimax rate asymptotically for a suitable choice of bandwidth whenever $(p,β) \in [1, 3) \times (0, 2]$ or $(p, β) \in \mathcal{A}_d$, where $\mathcal{A}_d$ is a specific subset of $[3, 4) \times (0, 2]$ that depends on the dimension $d$ of the Dirichlet kernel. It is also shown that this estimator cannot be minimax when either $p \in [4, \infty)$ or $β\in (2, \infty)$. These results extend to the multivariate case, and also rectify in a minor way, earlier findings of Bertin and Klutchnikoff (2011) concerning the minimax properties of Beta kernel estimators.

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