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Statistical spatial series modelling

Published online by Cambridge University Press:  01 July 2016

Dag Tjøstheim
Dag Tjøstheim*
Affiliation:
Royal Norwegian Council for Scientific and Industrial Research (NORSAR)
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Abstract

A random spatial series is a collection of random variables F(xi, · · ·, xn) depending on several spatial coordinates (x1, · · ·, xn). An attempt is made to construct a statistical second-order theory of such series when (x1, · · ·, xn) varies over a regular cartesian lattice. Using the properties of the linear (Hilbert) space associated with the series, the concepts of innovation and purely non-deterministic (p.n.d.) series are introduced. For a p.n.d. series F(x1, · · ·, xn) a unilateral representation is obtained in terms of a white innovations series Z(y1, · · ·, yn) where The representatation is specialized to the homogeneous case and we discuss spectral conditions for p.n.d. The familiar time-series condition ∫ log f(λ) dλ > –∞ on the spectral density f is necessary but not sufficient. A sufficient condition is stated. Motivated by the p.n.d. unilateral representation results we define unilateral arma (autoregressive-moving average) spatial series models. Stability and invertibility conditions are formulated in terms of the location of zero sets of polynomials relative to the unit polydisc in Cn, and a rigorous shift operator formalism is established. For autoregressive spatial series a Yule–Walker-type matrix equation is formulated and it is shown how this can be used to obtain estimates of the autoregressive parameters. It is demonstrated that under mild conditions the estimates are consistent and asymptotically normal.

Keywords

SPATIAL SERIESREGULAR CARTESIAN LATTICEPURELY NON-DETERMINISTICSHIFT OPERATOR FORMALISMUNILATERAL ARMA MODELSYULE–WALKER ESTIMATESASYMPTOTIC PROPERTIES
Type
Research Article
Information
Advances in Applied Probability , Volume 10 , Issue 1 , March 1978 , pp. 130 - 154
Copyright
Copyright © Applied Probability Trust 1978 

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Footnotes

This research was supported by the Advanced Research Projects Agency of the U.S. Department of Defense and was monitored by AFTAC, Patrick AFB FL 32925, under Contract No. F08606-77-C-0001.

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