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• W2956020384 abstract "We provide a computationally and statistically efficient method for estimating the parameters of a stochastic Gaussian model observed on a spatial grid, which need not be rectangular. Standard methods are plagued by computational intractability, where designing methods that can be implemented for realistically sized problems has been an issue for a long time. This has motivated the use of the Fourier Transform and the Whittle likelihood approximation. The challenge of frequency-domain methods is to determine and account for observational boundary effects, missing data, and the shape of the observed spatial grid. In this paper we address these effects explicitly by proposing a new quasi-likelihood estimator. We prove consistency and asymptotic normality of our estimator in settings that include irregularly shaped grids. Our simulations show that the proposed method solves boundary issues with Whittle estimation for random fields, yielding parameter estimates with significantly reduced bias and error. We demonstrate the effectiveness of our method for incomplete lattices, in comparison to other recent methods. Finally, we apply our method to estimate the parameters of a Mat'ern process used to model data from Venus' topography." @default.
• W2956020384 created "2019-07-12" @default.
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• W2956020384 date "2019-07-04" @default.
• W2956020384 modified "2023-09-27" @default.
• W2956020384 title "Efficient Parameter Estimation of Sampled Random Fields" @default.
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