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Spatiotemporal modelling using integro-difference equations with bivariate stable kernels
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DOI：10.1111/rssb.12393.png)
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摘要
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An integro-difference equation can be represented as a hierarchical spatiotemporal dynamic model using appropriate parameterizations. The dynamics of the process defined by an integro-difference equation depends on the choice of a bivariate kernel distribution, where more flexible shapes generally result in more flexible models. Under a Bayesian modelling framework, we consider the use of the stable family of distributions for the kernel, as they are infinitely divisible and offer a variety of tail behaviours, orientations and skewness. Many of the attributes of the bivariate stable distribution are controlled by a measure, which we model using a flexible Bernstein polynomial basis prior. The method is the first attempt to incorporate non-Gaussian kernels in a two-dimensional integro-difference equation model and will be shown to improve prediction over the Gaussian kernel model for a data set of Pacific sea surface temperatures.
Keyword:
Bernstein polynomials
Elliptically contoured stable distributions
Fourier series
Markov chain Monte Carlo methods
Semiparametric Bayesian modelling
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3.6
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1.5K
被引数:
3.2W
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