Multivariate Type G Matérn Stochastic Partial Differential Equation Random Fields
基于随机偏微分方程的多元 G 型 Matérn 随机场AI 解读 ↓
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基于随机偏微分方程的多元 G 型 Matérn 随机场AI 解读 ↓
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Summary For many applications with multivariate data, random-field models capturing departures from Gaussianity within realizations are appropriate. For this reason, we formulate a new class of multivariate non-Gaussian models based on systems of stochastic partial differential equations with additive type G noise whose marginal covariance functions are of Matérn type. We consider four increasingly flexible constructions of the noise, where the first two are similar to existing copula-based models. In contrast with these, the last two constructions can model non-Gaussian spatial data without replicates. Computationally efficient methods for likelihood-based parameter estimation and probabilistic prediction are proposed, and the flexibility of the models suggested is illustrated by numerical examples and two statistical applications.