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arXiv 0808.2152math.STstat.TH
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基于高斯设计的高维高斯模型选择

High-dimensional Gaussian model selection on a Gaussian design

Nicolas Verzelen

摘要:

我们考虑估计一个真正的高斯变量$\nolinebreak Y=\sum_{i=1}^p\nolinebreakθ_iX_i+\nolinebreak ε$的协变量$(X_i)_{1\leq i\leq p}$的向量遵循联合高斯分布的条件均值的问题。这个问题经常发生在一个旨在估计的图形或高斯图形模型的分布。我们介绍了一个一般的模型选择过程,这是基于惩罚最小二乘型标准的最小化。它处理各种各样的问题,如有序和完整的变量选择,允许将一些先验知识的模型和应用时,协变量的数量$p$是大于观察数$n$。此外,它被证明是独立的协变量的相关结构实现非渐近预言不等式。我们还表现出各种极小极大率的估计所考虑的框架,因此,我们的程序的自适应特性。

英文摘要:

We consider the problem of estimating the conditional mean of a real Gaussian variable $\nolinebreak Y=\sum_{i=1}^p\nolinebreakθ_iX_i+\nolinebreak ε$ where the vector of the covariates $(X_i)_{1\leq i\leq p}$ follows a joint Gaussian distribution. This issue often occurs when one aims at estimating the graph or the distribution of a Gaussian graphical model. We introduce a general model selection procedure which is based on the minimization of a penalized least-squares type criterion. It handles a variety of problems such as ordered and complete variable selection, allows to incorporate some prior knowledge on the model and applies when the number of covariates $p$ is larger than the number of observations $n$. Moreover, it is shown to achieve a non-asymptotic oracle inequality independently of the correlation structure of the covariates. We also exhibit various minimax rates of estimation in the considered framework and hence derive adaptiveness properties of our 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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