Fitting negative spatial covariances to geothermal field temperatures in Nea Kessani (Greece)

Jorge Mateu, Emilio Porcu, George Christakos, Moreno Bevilacqua

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

11 Citas (Scopus)

Resumen

In this paper, we investigate the problem of negative empirical covariances for temperature data in a three-dimensional geothermal field. We make use of permissibility criteria that allow a linear combination of covariance functions to be positive definite even if some of the weights of the linear combination are set to be negative. We thus propose a generalized sum of spatial covariance structures to model negative spatial covariances. We evaluate the performance of the proposed model, together with that of other celebrated, and widely used covariance functions. Comparison is done in terms of cross-validation, which allows to evaluate the relative bias, accuracy of estimation, and goodness-of-fit.

Idioma originalInglés
Páginas (desde-hasta)759-773
Número de páginas15
PublicaciónEnvironmetrics
Volumen18
N.º7
DOI
EstadoPublicada - nov. 2007

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