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ARMA Memory Index Modeling of Economic Time Series

Published online by Cambridge University Press:  18 October 2010

Herman J. Bierens
Affiliation:
Free University, Amsterdam

Abstract

In this paper, it will be shown that if we condition a k-variate rational-valued time series process on its entire past, it is possible to capture all relevant information on the past of the process by a single random variable. This scalar random variable can be formed as an autoregressive moving average of past observations; Since economic data are usually reported in a finite number of digits, this result applies to virtually all economic time series. Therefore, economic time series regressions generally take the form of a nonlinear function of an autoregressive moving average of past observations. This approach is applied to model specification testing of nonlinear ARX models.

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Articles
Copyright
Copyright © Cambridge University Press 1988

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