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arXiv 0704.2500math.STstat.TH
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集结估计量的一种通用方法

A universal procedure for aggregating estimators

Alexander Goldenshluger

摘要:

在本文中,我们研究的聚集问题,可以制定如下。假设我们有一个族的估计量$\mathcal{F}$建立在可用的观察的基础上。我们的目标是构造一个新的估计,其风险尽可能接近家庭中的最佳估计。我们提出了一个通用的聚合方案,在以下意义上是普遍的:它适用于家庭的任意估计和各种各样的模型和全球风险措施。该程序是基于某些线性泛函的经验估计与估计引起的家庭$\mathcal{F}$的比较。我们导出了Oracle不等式,并证明了它们在某种意义下是不可改进的。数值结果表明该方法具有良好的实用性。

英文摘要:

In this paper we study the aggregation problem that can be formulated as follows. Assume that we have a family of estimators $\mathcal{F}$ built on the basis of available observations. The goal is to construct a new estimator whose risk is as close as possible to that of the best estimator in the family. We propose a general aggregation scheme that is universal in the following sense: it applies for families of arbitrary estimators and a wide variety of models and global risk measures. The procedure is based on comparison of empirical estimates of certain linear functionals with estimates induced by the family $\mathcal{F}$. We derive oracle inequalities and show that they are unimprovable in some sense. Numerical results demonstrate good practical behavior of the procedure.

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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