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- Porcu, Emilio, et al. Show all 3 Authors
- Stochastic environmental research and risk assessment 2018 v.32 no.11 pp. 3053-3066
- covariance; geostatistics; models
- ... Nested covariance models, defined as linear combinations of basic covariance functions, are very popular in many branches of applied statistics, and in particular in geostatistics. A notorious limit of nested models is that the constants in the linear combination are bound to be nonnegative in order to preserve positive definiteness (admissibility). This paper studies nested models on d-dimensiona ...