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arXiv 1702.03557stat.MEmath.STstat.TH
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离散模型下最小$S$ -散度估计小样本效率的改进

Improvements in the Small Sample Efficiency of the Minimum $S$-Divergence Estimators under Discrete Models

Abhik Ghosh, Ayanendranath Basu

摘要:

本文考虑了离散总体中纯样本下的内点和空单元问题,以及由此产生的小样本情况下估计相对无效的问题。在$S$ -发散族中的许多最小发散估计,虽然具有非常强的离群值稳定性,但在存在内点的情况下通常具有非常差的小样本效率,并且有些甚至在存在单个空单元的情况下没有定义;这限制了这些估计的实际适用性,尽管它们具有良好的鲁棒性和高渐近有效性。在这里,我们将研究一个惩罚版本的$S$ -发散,使所得的最小发散估计是免费的,从这些问题,而不改变其鲁棒性和渐近有效性。我们将给出这些最小惩罚$S$ -散度估计的渐近性质的一般证明。这为文献提供了一个重要的补充,因为目前文献中没有定义的惩罚发散的渐近性。最小惩罚$S$ -发散估计的小样本优势,通过广泛的模拟研究和一些经验的建议,有关的基本调谐参数的选择也提供了检查。

英文摘要:

This paper considers the problem of inliers and empty cells and the resulting issue of relative inefficiency in estimation under pure samples from a discrete population when the sample size is small. Many minimum divergence estimators in the $S$-divergence family, although possessing very strong outlier stability properties, often have very poor small sample efficiency in the presence of inliers and some are not even defined in the presence of a single empty cell; this limits the practical applicability of these estimators, in spite of their otherwise sound robustness properties and high asymptotic efficiency. Here, we will study a penalized version of the $S$-divergences such that the resulting minimum divergence estimators are free from these issues without altering their robustness properties and asymptotic efficiencies. We will give a general proof for the asymptotic properties of these minimum penalized $S$-divergence estimators. This provides a significant addition to the literature as the asymptotics of penalized divergences which are not finitely defined are currently unavailable in the literature. The small sample advantages of the minimum penalized $S$-divergence estimators are examined through an extensive simulation study and some empirical suggestions regarding the choice of the relevant underlying tuning parameters are also provided.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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