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arXiv 2602.16463stat.ME
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聚焦相对风险信息准则用于线性回归中的变量选择

Focused Relative Risk Information Criterion for Variable Selection in Linear Regression

University of Oslo(奥斯陆大学)

Nils Lid Hjort

AI总结:

本文提出聚焦相对风险信息准则用于线性回归变量选择,通过置信分布理论评估相对风险,平衡模型复杂度和拟合度。

摘要:

本文提出了一个新的聚焦方法用于线性回归模型中的变量选择。对于估计回归均值μ= E(Y| x₀),给定个体的协变量向量有一系列竞争估计量,即每个子模型S的hatμ_S。当与最宽模型相比时,可以找到相对均方误差风险的确切表达式,即mse_S/mse_宽。利用置信分布理论对这些相对风险进行准确评估。这导致了某些聚焦相对风险信息准则分数,以及相关的FRIC图和FRIC表,以及置信图以展示数据对子模型的信心。该方法被扩展以同时处理多个焦点参数,适当平均FRIC分数。当所有可用协变量向量具有相等重要性时,得出一个新的变量选择整体准则,以自然的方式平衡复杂性和拟合。展示了与Mallows准则的联系,也导致了后者的自然修改。FRIC和AFRIC策略在实际数据上进行了说明。

英文摘要:

This paper motivates and develops a novel and focused approach to variable selection in linear regression models. For estimating the regression mean $μ=\E\,(Y\midd x_0)$, for the covariate vector of a given individual, there is a list of competing estimators, say $\hattμ_S$ for each submodel $S$. Exact expressions are found for the relative mean squared error risks, when compared to the widest model available, say $\mse_S/\mse_\wide$. The theory of confidence distributions is used for accurate assessments of these relative risks. This leads to certain Focused Relative Risk Information Criterion scores, and associated FRIC plots and FRIC tables, as well as to Confidence plots to exhibit the confidence the data give in the submodels. The machinery is extended to handle many focus parameters at the same time, with appropriate averaged FRIC scores. The particular case where all available covariate vectors have equal importance yields a new overall criterion for variable selection, balancing complexity and fit in a natural fashion. A connection to the Mallows criterion is demonstrated, leading also to natural modifications of the latter. The FRIC and AFRIC strategies are illustrated for real data.

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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