Personal information

Spatio-Temporal Statistics, Random Fields, Positive Definite Functions
Chile

Activities

Employment (2)

Universidad Técnica Federico Santa María: Valparaiso, CL

2018-08-01 to present | Academic (Departamento de Matemática)
Employment
Source: Self-asserted source
Alfredo Alegría

Newcastle University: Newcastle upon Tyne, Tyne and Wear, GB

2017-09-01 to 2018-08-31 | Research Associate (School of Mathematics, Statistics and Physics)
Employment
Source: Self-asserted source
Alfredo Alegría

Education and qualifications (2)

Universidad Técnica Federico Santa María: Valparaiso, CL

2015-03-01 to 2017-05-31 | PhD Mathematics (Departamento de Matemática)
Education
Source: Self-asserted source
Alfredo Alegría

Universidad Técnica Federico Santa María: Valparaiso, CL

2008-03-01 to 2014-11-30 | Mathematical Engineer (Departamento de Matemática)
Education
Source: Self-asserted source
Alfredo Alegría

Funding (1)

New Developments in Multivariate Spatial Statistics: Anisotropies by Components, Cross-Dimples, and Non-Normal Distributions, and their Applications

2019-11 to 2022-10 | Grant
Fondo Nacional de Desarrollo Científico y Tecnológico (Santiago, CL)
GRANT_NUMBER:

11190686

Source: Self-asserted source
Alfredo Alegría

Works (24)

Hybrid Parametric Classes of Isotropic Covariance Functions for Spatial Random Fields

Mathematical Geosciences
2024-10 | Journal article
Contributors: Alfredo Alegría; Fabián Ramírez; Emilio Porcu
Source: check_circle
Crossref

Matrix-valued isotropic covariance functions with local extrema

Journal of Multivariate Analysis
2024-03 | Journal article
Contributors: Alfredo Alegría; Xavier Emery
Source: check_circle
Crossref

Gaussian random fields on the product of spheres: Theory and applications

Electronic Journal of Statistics
2024-01-01 | Journal article
Part of ISSN: 1935-7524
Contributors: Alfredo Alegría; Galatia Cleanthous; Athanasios G. Georgiadis; Emilio Porcu; Philip A. White
Source: Self-asserted source
Alfredo Alegría

Spectral Simulation of Gaussian Vector Random Fields on the Sphere

Springer Proceedings in Earth and Environmental Sciences
2023 | Book chapter
Part of ISBN: 9783031198441
Part of ISBN: 9783031198458
Part of ISSN: 2524-342X
Part of ISSN: 2524-3438
Contributors: Alfredo Alegría; Xavier Emery; Xavier Freulon; Christian Lantuéjoul; Emilio Porcu; Didier Renard
Source: Self-asserted source
Alfredo Alegría

Effective sample size for georeferenced and temporally evolving data

Spatial Statistics
2023-03 | Journal article
Part of ISSN: 2211-6753
Contributors: Alfredo Alegría
Source: Self-asserted source
Alfredo Alegría

The Gauss hypergeometric covariance kernel for modeling second-order stationary random fields in Euclidean spaces: its compact support, properties and spectral representation

Stochastic Environmental Research and Risk Assessment
2022-09 | Journal article
Part of ISSN: 1436-3240
Part of ISSN: 1436-3259
Contributors: Xavier Emery; Alfredo Alegría
Source: Self-asserted source
Alfredo Alegría

Bivariate Matérn covariances with cross-dimple for modeling coregionalized variables

Spatial Statistics
2021 | Journal article
EID:

2-s2.0-85099805290

Part of ISSN: 22116753
Contributors: Alegría, A.; Emery, X.; Porcu, E.
Source: Self-asserted source
Alfredo Alegría via Scopus - Elsevier

Assessing the effective sample size for large spatial datasets: A block likelihood approach

Computational Statistics & Data Analysis
2021-10 | Journal article
Part of ISSN: 0167-9473
Source: Self-asserted source
Alfredo Alegría

The F-family of covariance functions: A Matérn analogue for modeling random fields on spheres

Spatial Statistics
2021-06 | Journal article
Part of ISSN: 2211-6753
Source: Self-asserted source
Alfredo Alegría

Covariance Models and Simulation Algorithm for Stationary Vector Random Fields on Spheres Crossed with Euclidean Spaces

SIAM Journal on Scientific Computing
2021-01 | Journal article
Part of ISSN: 1064-8275
Part of ISSN: 1095-7197
Source: Self-asserted source
Alfredo Alegría

Multivariate isotropic random fields on spheres: Nonparametric Bayesian modeling and Lp fast approximations

Electronic Journal of Statistics
2021-01-01 | Journal article
Part of ISSN: 1935-7524
Source: Self-asserted source
Alfredo Alegría

A spectral algorithm to simulate nonstationary random fields on spheres and multifractal star-shaped random sets

Stochastic Environmental Research and Risk Assessment
2020-08-14 | Journal article
Part of ISSN: 1436-3240
Part of ISSN: 1436-3259
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Karhunen–Loève expansions for axially symmetric Gaussian processes: modeling strategies and $$L^2$$ approximations

Stochastic Environmental Research and Risk Assessment
2020-07-21 | Journal article
Part of ISSN: 1436-3240
Part of ISSN: 1436-3259
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

The turning arcs: a computationally efficient algorithm to simulate isotropic vector-valued Gaussian random fields on the d-sphere

Statistics and Computing
2020-06-04 | Journal article
Part of ISSN: 0960-3174
Part of ISSN: 1573-1375
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Cross‐dimple in the cross‐covariance functions of bivariate isotropic random fields on spheres

Stat
2020-01 | Journal article
Contributors: Alfredo Alegría
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Covariance functions for multivariate Gaussian fields evolving temporally over planet earth

Stochastic Environmental Research and Risk Assessment
2019-09 | Journal article
Part of ISSN: 1436-3240
Part of ISSN: 1436-3259
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Axially symmetric models for global data: A journey between geostatistics and stochastic generators

Environmetrics
2019-02 | Journal article
Part of ISSN: 1180-4009
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Regularity properties and simulations of Gaussian random fields on the sphere cross time

Electronic Journal of Statistics
2018 | Journal article
Part of ISSN: 1935-7524
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Modeling Temporally Evolving and Spatially Globally Dependent Data

International Statistical Review
2018-08 | Journal article
Part of ISSN: 0306-7734
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Asymmetric matrix-valued covariances for multivariate random fields on spheres

Journal of Statistical Computation and Simulation
2018-07-03 | Journal article
Part of ISSN: 0094-9655
Part of ISSN: 1563-5163
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Estimating covariance functions of multivariate skew-Gaussian random fields on the sphere

Spatial Statistics
2017-11 | Journal article
Part of ISSN: 2211-6753
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

The dimple problem related to space–time modeling under the Lagrangian framework

Journal of Multivariate Analysis
2017-11 | Journal article
Part of ISSN: 0047-259X
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Composite Likelihood Inference for Multivariate Gaussian Random Fields

Journal of Agricultural, Biological, and Environmental Statistics
2016-09 | Journal article
Part of ISSN: 1085-7117
Part of ISSN: 1537-2693
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎

Likelihood-based inference for multivariate space-time wrapped-Gaussian fields

Journal of Statistical Computation and Simulation
2016-09 | Journal article
Part of ISSN: 0094-9655
Part of ISSN: 1563-5163
Source: Self-asserted source
Alfredo Alegría
grade
Preferred source (of 2)‎