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Spectral Methods for Nonstationary Spatial Processes
Vol. 89, No. 1 (Mar., 2002), pp. 197-210
Stable URL: http://www.jstor.org/stable/4140567
Page Count: 14
You can always find the topics here!Topics: Spectral energy distribution, Covariance, Stationary processes, Estimators, Density estimation, Spatial models, Statistical estimation, Statistical variance, Air pollution, Space based observatories
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We propose a nonstationary periodogram and various parametric approaches for estimating the spectral density of a nonstationary spatial process. We also study the asymptotic properties of the proposed estimators via shrinking asymptotics, assuming the distance between neighbouring observations tends to zero as the size of the observation region grows without bound. With this type of asymptotic model we can uniquely determine the spectral density, avoiding the aliasing problem. We also present a new class of nonstationary processes, based on a convolution of local stationary processes. This model has the advantage that the model is simultaneously defined everywhere, unlike 'moving window' approaches, but it retains the attractive property that, locally in small regions, it behaves like a stationary spatial process. Applications include the spatial analysis and modelling of air pollution data provided by the US Environmental Protection Agency.
Biometrika © 2002 Biometrika Trust