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AI 根据所提供的论文材料归类:摘要讨论通用非参数平滑与模型检验,未明确涉及所列领域细分的专门问题。

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代码、数据与补充材料

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关注这篇论文的作者
Chunming Zhang

校准自由度:自动数据平滑与有效曲线检验

研究问题
局部多项式回归中,如何刻画线性平滑器的模型复杂度,并利用自由度校准实现自动带宽选择和曲线检验?
方法与思路
作者研究自由度的渐近表达与经验公式,以经验自由度替代精确值构造EGCV,并通过最小化该准则选择带宽。
材料陈述的贡献
摘要称,该方法降低交叉验证的计算负担,可扩展至变系数等多变量模型,并用于模型假设检验和变量显著性评估。
阅读关注点
应核对自由度经验公式的适用条件、带宽选择的理论保证,以及广义似然比检验中校准方式与模拟比较设置。
阅读边界
仅据版本未注明的OpenAlex索引摘要,无法判断计算节省幅度、有限样本检验表现或具体正则条件,亦未核验刊本差异。

原文摘要

Curve fitting and curve checking based on the local polynomial regression technique are commonly used data-analytic methods in statistics. This article examines, in nonparametric settings, both the asymptotic expressions and empirical formulas for degrees of freedom (DF), a notion introduced by Hastie and Tibshirani, of linear smoothers. The asymptotic results give useful insights into the nonparametric modeling complexity. Meanwhile, by substituting the exact DFs by the empirical formula, an empirical version of the generalized cross-validation (EGCV) is obtained. An automatic bandwidth selection method based on minimizing EGCV is proposed for conducting local smoothing. This procedure preserves full benefits of the ordinary and generalized cross-validation, but offers a substantial reduction in computational burden. Furthermore, the EGCV-minimizing bandwidth can be extended in a very simple manner to fit multivariate models, such as the varying-coefficient models. Applications of calibrating DFs to important inferential issues, such as assessing the validity of useful model assumptions and measuring the significance of predictor variables based on the generalized likelihood ratio statistics are also discussed. Simulation studies are presented to illustrate the performance of the proposed procedures in a range of statistical problems.

笔记与分组
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