Abstract
We consider the problem of numerical approximation of integrals of random fields over a unit hypercube. We use a stratified Monte Carlo quadrature and measure the approximation performance by the mean squared error. The quadrature is defined by a finite number of stratified randomly chosen observations with the partition generated by a rectangular grid (or design). We study the class of locally stationary random fields whose local behaviour is like a fractional Brownian field in the mean square sense and find the asymptotic approximation accuracy for a sequence of designs for large number of the observations. For the Hölder class of random functions, we provide an upper bound for the approximation error. Additionally, for a certain class of isotropic random functions with an isolated singularity at the origin, we construct a sequence of designs eliminating the effect of the singularity point.
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Abramowicz, K., Seleznjev, O. Stratified Monte Carlo Quadrature for Continuous Random Fields. Methodol Comput Appl Probab 17, 59–72 (2015). https://doi.org/10.1007/s11009-013-9347-6
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DOI: https://doi.org/10.1007/s11009-013-9347-6