Visualitza INIT_Articles per autoria "23afdba9-4836-4b3e-835e-9e7870d53115"
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A family of Markov processes in maximal compact subgroups of a semisimple Lie groups
Arafat, Ahmed; Mateu, Jorge; Gregori, Pablo Elsevier (2017)We propose and define a family of marked point processes in noncompact semisimple Lie groups. We first generate Lévy processes via marked point processes by using jump–diffusion processes. Then we build a family of Markov ... -
ABC Shadow algorithm: a tool for statistical analysis of spatial patterns
Stoica, Radu; PHILIPPE, Anne; Gregori, Pablo; Mateu, Jorge Springer Verlag (2017)This paper presents an original ABC algorithm, ABC Shadow, that can be applied to sample posterior densities that are continuously differentiable. The proposed algorithm solves the main condition to be fulfilled by any ABC ... -
Models of covariance functions of gaussian random fields escaping from isotropy, stationarity and non negativity
Gregori, Pablo; Porcu, Emilio; Mateu, Jorge International Society for Stereology (2014-01)This paper represents a survey of recent advances in modeling of space or space-time Gaussian Random Fields (GRF), tools of Geostatistics at hand for the understanding of special cases of noise in image analysis. They can ... -
New classes of spectral densities for lattice processes and random fields built from simple univariate margins
Porcu, Emilio; Mateu, Jorge; Gregori, Pablo; Ostoja-Starzewski, Martin 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 , ...