Cross-validation estimation of covariance parameters under fixed-domain asymptotics

JOURNAL OF MULTIVARIATE ANALYSIS

卷:160

Article

Bachoc, Francois¹  Lagnoux, Agnes¹  Nguyen, Thi Mong Ngoc¹ 

[1] Univ Toulouse 3, Inst Math Toulouse, F-31062 Toulouse 9, France

关键词: Asymptotic normality;    Cross validation;    Fixed-domain asymptotics;    Kriging;    Spatial sampling;    Strong consistency;   

DOI  :  10.1016/j.jmva.2017.06.003

来源: Elsevier

【 摘 要 】

We consider a one-dimensional Gaussian process having exponential covariance function. Under fixed-domain asymptotics, we prove the strong consistency and asymptotic normality of a cross validation estimator of the microergodic covariance parameter. In this setting, Ying (1991) proved the-same asymptotic properties for the maximum likelihood estimator. Our proof includes several original or more involved components, compared to that of Ying. Also, while the asymptotic variance of maximum likelihood does not depend on the triangular array of observation points under consideration, that of cross validation does, and is shown to be lower and upper bounded. The lower bound coincides with the asymptotic variance of maximum likelihood. We provide examples of triangular arrays of observation points achieving the lower and upper bounds. We illustrate our asymptotic results with simulations, and provide extensions to the case of an unknown mean function. To our knowledge, this work constitutes the first fixed-domain asymptotic analysis of cross validation. (C) 2017 Elsevier Inc. All rights reserved.

【 授权许可】

Free