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• W4283068317 abstract "We propose a covariance specification for modeling spatially continuous multivariate data. This model is based on a reformulation of Kronecker’s product of covariance matrices for Gaussian random fields. The structure holds for different choices of covariance functions with parameters varying in their usual domains. In comparison with classical models from the literature, we used the Matérn correlation function to specify the marginal covariances. We also assess the reparametrized generalized Wendland model as an option for efficient calculation of the Cholesky decomposition, improving the model’s ability to deal with large data sets. The reduced computational time and flexible generalization for increasing number of variables, make it an attractive alternative for modelling spatially continuous data. The proposed model is fitted to a soil chemistry properties dataset, and adequacy measures, forecast errors and estimation times are compared with the ones obtained based on classical models. In addition, the model is fitted to a North African temperature dataset to illustrate the model’s flexibility in dealing with large data. A simulation study is performed considering different parametric scenarios to evaluate the properties of the maximum likelihood estimators. The simple structure and reduced estimation time make the proposed model a candidate approach for multivariate analysis of spatial data." @default.
• W4283068317 created "2022-06-19" @default.
• W4283068317 creator A5042728243 @default.
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• W4283068317 date "2022-06-17" @default.
• W4283068317 modified "2023-10-16" @default.
• W4283068317 title "A Kronecker-based covariance specification for spatially continuous multivariate data" @default.
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• W4283068317 doi "https://doi.org/10.1007/s00477-022-02252-9" @default.
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