Listar por tema "Nonseparability"
Mostrando ítems 1-3 de 3
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New classes of spectral densities for lattice processes and random fields built from simple univariate margins
Springer-Verlag (2012-05)Quasi arithmetic and Archimedean functionals are used to build new classes of spectral densities for processes defined on any d-dimensional lattice Zd and random fields defined on the d-dimensional Euclidean space Rd , ... -
On potentially negative space time covariances obtained as sum of products of marginal ones
Springer Verlag (2008)Most of the literature on spatio-temporal covariance models proposes structures that are positive in the whole domain. However, problems of physical, biological or medical nature need covariance models allowing for ... -
Quasi-arithmetic means of covariance functions with potential applications to space-time data
Elsevier (2009)The theory of quasi-arithmetic means represents a powerful tool in the study of covariance functions across space-time. In the present study we use quasi-arithmetic functionals to make inferences about the permissibility ...