A NOTE ON NON‐STATIONARITY AND CANONICAL ANALYSIS OF MULTIPLE TIME SERIES MODELS

Abstract
Box and Tiao (1977) established the correspondence between non‐stationary roots and canonical correlations of an AR(1) process. In this paper, we give an alternative, more direct, proof of the correspondence and extend a special case of that result to AR(p) processes. The usefulness of these results for multiple time series modelling is also briefly discussed.

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