精确矩阵的截断估计器

IF 0.8 Q3 STATISTICS & PROBABILITY
Anis M. Haddouche, Dominique Fourdrinier
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引用次数: 0

摘要

Abstract 在本文中,我们通过高斯多元线性回归模型的规范形式来估计其精度矩阵({\({Z}^{T},{U}^{T})^{T}),其中\(Z\)和\(U\)分别是一个\(m/times p\) 矩阵和一个\(n/times p\) 矩阵。在基于数据的损失函数\(textrm{tr}\ [({\hat{Sigma}}^{-1}-{\Sigma}^{-1})S]^{2}\) 下,这个问题得到了解决,其中\({\hat{Sigma}}^{-1}\)以统一的方法估计了\({\Sigma}^{-1}\),对于\(m,n\)和\(p\)的任意排序。除了样本协方差矩阵\(S={U}^{T}U\)中包含的信息外,我们还得出了使用样本平均值\(Z\)中包含的信息的估计值。我们提供了这些估计值优于通常估计值的条件,其中 \(a\)是一个正常数,\({S}^{+}\)是\(S\)的摩尔-彭罗斯倒数。由于\(Z\)的作用,这些估计值也会通过它们的截断版本得到改进。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Truncated Estimators for a Precision Matrix

Truncated Estimators for a Precision Matrix

Abstract

In this paper, we estimate the precision matrix \({\Sigma}^{-1}\) of a Gaussian multivariate linear regression model through its canonical form \(({Z}^{T},{U}^{T})^{T}\) where \(Z\) and \(U\) are respectively an \(m\times p\) and an \(n\times p\) matrices. This problem is addressed under the data-based loss function \(\textrm{tr}\ [({\hat{\Sigma}}^{-1}-{\Sigma}^{-1})S]^{2}\), where \({\hat{\Sigma}}^{-1}\) estimates \({\Sigma}^{-1}\), for any ordering of \(m,n\) and \(p\), in a unified approach. We derive estimators which, besides the information contained in the sample covariance matrix \(S={U}^{T}U\), use the information contained in the sample mean \(Z\). We provide conditions for which these estimators improve over the usual estimators \(a{S}^{+}\) where \(a\) is a positive constant and \({S}^{+}\) is the Moore-Penrose inverse of \(S\). Thanks to the role of \(Z\), such estimators are also improved by their truncated version.

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来源期刊
Mathematical Methods of Statistics
Mathematical Methods of Statistics STATISTICS & PROBABILITY-
CiteScore
0.60
自引率
0.00%
发文量
2
期刊介绍: Mathematical Methods of Statistics  is an is an international peer reviewed journal dedicated to the mathematical foundations of statistical theory. It primarily publishes research papers with complete proofs and, occasionally, review papers on particular problems of statistics. Papers dealing with applications of statistics are also published if they contain new theoretical developments to the underlying statistical methods. The journal provides an outlet for research in advanced statistical methodology and for studies where such methodology is effectively used or which stimulate its further development.
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