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arXiv 1301.3017math.STstat.TH
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泛函线性模型中的非渐近自适应预测

Non-asymptotic Adaptive Prediction in Functional Linear Models

Elodie Brunel, André Mas, Angelina Roche

摘要:

函数线性回归最近引起了人们极大的兴趣。许多工作集中在渐近推理。在本文中,我们考虑在一个非渐近的框架下,一个简单的估计程序的基础上功能主回归。它围绕在最小化的最小二乘对比加上一个经典的投影上的空间跨越的第一个经验特征向量的协方差算子的功能样本。我们的方法的新颖性是自动选择的关键尺寸m的最小化的惩罚最小二乘对比。我们的方法是基于模型选择工具。然而,由于这类方法通常包括投影到已知的非随机空间,我们需要使其适应由数据相关的(因此是随机向量)组成的经验本征基。由此产生的估计是完全自适应的,并验证了预言不等式的预测误差的风险,并达到最佳的极小极大收敛速度在一定的一类椭球。我们的模型选择策略最后进行了数值比较,交叉验证。

英文摘要:

Functional linear regression has recently attracted considerable interest. Many works focus on asymptotic inference. In this paper we consider in a non asymptotic framework a simple estimation procedure based on functional Principal Regression. It revolves in the minimization of a least square contrast coupled with a classical projection on the space spanned by the m first empirical eigenvectors of the covariance operator of the functional sample. The novelty of our approach is to select automatically the crucial dimension m by minimization of a penalized least square contrast. Our method is based on model selection tools. Yet, since this kind of methods consists usually in projecting onto known non-random spaces, we need to adapt it to empirical eigenbasis made of data-dependent - hence random - vectors. The resulting estimator is fully adaptive and is shown to verify an oracle inequality for the risk associated to the prediction error and to attain optimal minimax rates of convergence over a certain class of ellipsoids. Our strategy of model selection is finally compared numerically with cross-validation.

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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