arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.02140math.STstat.TH
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模型不确定下的线性回归

Linear regression under model uncertainty

Shuzhen Yang, Jianfeng Yao

摘要:

我们重新审视经典的线性回归模型,当模型受到两种类型的不确定性:(i)一些协变量缺失或完全不可访问,(ii)测量误差的方差是未知的,并根据统计学家未知的机制变化。根据最近的次线性期望理论,我们提出用两个特定的非线性随机变量来描述响应变量的均值和方差的不确定性,这两个非线性随机变量包含了响应变量在线性古典概率理论意义下的概率分布的无限族。该方法使一个家庭的估计在各种损失函数的回归参数和参数的模型不确定性。在较弱的条件下,证明了估计量的相合性。介绍了三个应用程序,以评估质量的方法,包括S\&P指数的预测模型。

英文摘要:

We reexamine the classical linear regression model when the model is subject to two types of uncertainty: (i) some of covariates are either missing or completely inaccessible, and (ii) the variance of the measurement error is undetermined and changing according to a mechanism unknown to the statistician. By following the recent theory of sublinear expectation, we propose to characterize such mean and variance uncertainty in the response variable by two specific nonlinear random variables, which encompass an infinite family of probability distributions for the response variable in the sense of (linear) classical probability theory. The approach enables a family of estimators under various loss functions for the regression parameter and the parameters related to model uncertainty. The consistency of the estimators is established under mild conditions on the data generation process. Three applications are introduced to assess the quality of the approach including a forecasting model for the S\&P Index.

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