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Multivariate Intrinsic Random Functions for Cokriging

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Abstract

In multivariate geostatistics, suppose that we relax the usual second-order-stationarity assumptions and assume that the component processes are intrinsic random functions of general orders. In this article, we introduce a generalized cross-covariance function to describe the spatial cross-dependencies in multivariate intrinsic random functions. A nonparametric method is then proposed for its estimation. Based on this class of generalized cross-covariance functions, we give cokriging equations for multivariate intrinsic random functions in the presence of measurement error. A simulation is presented that demonstrates the accuracy of the proposed nonparametric estimation method. Finally, an application is given to a dataset of plutonium and americium concentrations collected from a region of the Nevada Test Site used for atomic-bomb testing.

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Correspondence to Noel Cressie.

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Huang, C., Yao, Y., Cressie, N. et al. Multivariate Intrinsic Random Functions for Cokriging. Math Geosci 41, 887–904 (2009). https://doi.org/10.1007/s11004-009-9218-4

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  • DOI: https://doi.org/10.1007/s11004-009-9218-4

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