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AI 根据所提供的论文材料归类:摘要明确说明推断适用于函数型时间序列,并讨论变化点检测,因此选择时间序列与结构变化,未据回归一词推定微观领域。

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关注这篇论文的作者
Tim Kutta
Gauthier Dierickx
Holger Dette

函数型线性回归斜率算子的统计推断

研究问题
对解释变量与响应均为函数的线性回归,如何量化真实斜率算子相对假定算子的偏离,并为预测误差及变化提供推断?
方法与思路
作者使用序贯谱截断估计量和渐近枢轴统计量,并以“光滑性转移”证明技巧分析平方范数插件估计量的极限行为。
材料陈述的贡献
摘要称相关插件估计量具有根号样本量一致性及序贯弱不变原理,推断避免长期方差估计或依赖数据自助法的调参。
阅读关注点
应核对平滑性、谱截断与时间依赖条件,根号样本量结果的适用范围,以及枢轴构造和变化点问题的具体检验目标。
阅读边界
这是 arXiv 预印本,不能据此确认同行评审或期刊接收;摘要未列出正则条件,不能将相关速率推广到斜率算子本身。

原文摘要

In this paper we consider the linear regression model $Y =S X+\varepsilon $ with functional regressors and responses. We develop new inference tools to quantify deviations of the true slope $S$ from a hypothesized operator $S_0$ with respect to the Hilbert--Schmidt norm $\| S- S_0\|^2$, as well as the prediction error $\mathbb{E} \| S X - S_0 X \|^2$. Our analysis is applicable to functional time series and based on asymptotically pivotal statistics. This makes it particularly user friendly, because it avoids the choice of tuning parameters inherent in long-run variance estimation or bootstrap of dependent data. We also discuss two sample problems as well as change point detection. Finite sample properties are investigated by means of a simulation study.\\ Mathematically our approach is based on a sequential version of the popular spectral cut-off estimator $\hat S_N$ for $S$. It is well-known that the $L^2$-minimax rates in the functional regression model, both in estimation and prediction, are substantially slower than $1/\sqrt{N}$ (where $N$ denotes the sample size) and that standard estimators for $S$ do not converge weakly to non-degenerate limits. However, we demonstrate that simple plug-in estimators - such as $\| \hat S_N - S_0 \|^2$ for $\| S - S_0 \|^2$ - are $\sqrt{N}$-consistent and its sequential versions satisfy weak invariance principles. These results are based on the smoothing effect of $L^2$-norms and established by a new proof-technique, the {\it smoothness shift}, which has potential applications in other statistical inverse problems.

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