arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.14684math.STstat.TH
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多元地质统计学中的渐近等价预测

Asymptotically Equivalent Prediction in Multivariate Geostatistics

François Bachoc, Emilio Porcu, Moreno Bevilacqua, Reinhard Furrer, Tarik Faouzi

摘要:

协同克里格法是多元地质统计学中常用的空间插值(最佳线性无偏预测)方法。虽然最佳线性预测在单变量空间统计中已经得到很好的理解,但到目前为止,多变量情况下的文献一直难以捉摸。现代空间数据集提供了新的挑战,通常是多元的,需要更深入的研究协同克里金。特别是,我们处理的问题,误指定协同克里格预测的框架内固定域渐近。具体而言,我们提供的条件与多元高斯随机场的措施,在一个紧凑的d-维欧几里得空间的索引集的等价。在大约50多年的空间统计中,这种条件一直是难以捉摸的。然后,我们专注于多变量Matérn和广义Wendland类的矩阵值的协方差函数,已非常流行的参数是至关重要的空间插值,并控制相关的高斯过程的均方可微性。我们提供了充分条件,等价的高斯措施,依赖于这两个类的协方差参数。这使得识别参数是至关重要的渐近等价插值多元地质统计学。我们的研究结果,然后说明通过模拟研究。

英文摘要:

Cokriging is the common method of spatial interpolation (best linear unbiased prediction) in multivariate geostatistics. While best linear prediction has been well understood in univariate spatial statistics, the literature for the multivariate case has been elusive so far. The new challenges provided by modern spatial datasets, being typically multivariate, call for a deeper study of cokriging. In particular, we deal with the problem of misspecified cokriging prediction within the framework of fixed domain asymptotics. Specifically, we provide conditions for equivalence of measures associated with multivariate Gaussian random fields, with index set in a compact set of a d-dimensional Euclidean space. Such conditions have been elusive for over about 50 years of spatial statistics. We then focus on the multivariate Matérn and Generalized Wendland classes of matrix valued covariance functions, that have been very popular for having parameters that are crucial to spatial interpolation, and that control the mean square differentiability of the associated Gaussian process. We provide sufficient conditions, for equivalence of Gaussian measures, relying on the covariance parameters of these two classes. This enables to identify the parameters that are crucial to asymptotically equivalent interpolation in multivariate geostatistics. Our findings are then illustrated through simulation studies.

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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