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Linear processes are nearly Gaussian

Published online by Cambridge University Press:  14 July 2016

C. L. Mallows*
Affiliation:
Bell Telephone Laboratories Inc., Murray Hill, New Jersey

Abstract

Let U denote the set of all integers, and suppose that Y = {Yu; uU} is a process of standardized, independent and identically distributed random variables with finite third moment and with a common absolutely continuous distribution function (d.f.) G (·). Let a = {au; uU} be a sequence of real numbers with Σuau2 = 1. Then Xu = ΣwawYuw defines a stationary linear process X = {Xu; u ɛ U} with E(Xu) = 0, E(Xu2) = 1 for uU. Let F(·) be the d.f. of X0. We prove that if maxu |au| is small, then (i) for each w, Xw is close to Gaussian in the sense that ∫−∞(F(y) − Φ(y))2dyg maxu |au | where Φ(·) is the standard Gaussian d.f., and g depends only on G(·); (ii) for each finite set (w1, … wn), (Xw1, … Xwn) is close to Gaussian in a similar sense; (iii) the process X is close to Gaussian in a somewhat restricted sense. Several properties of the measures of distance from Gaussianity employed are investigated, and the relation of maxu|au| to the bandwidth of the filter a is studied.

Type
Research Papers
Copyright
Copyright © Sheffield: Applied Probability Trust 

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