Encompassing univariate models in multivariate time series: a case study (1994)

doi:10.1017/CBO9780511493171.013

12 - Encompassing univariate models in multivariate time series: a case study (1994)

Published online by Cambridge University Press: 24 October 2009

Agustín Maravall and

Alexandre Mathis

Edited by

Arnold Zellner and

Franz C. Palm

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Agustín Maravall: Affiliation:
Chief Economist SIMC, Banco de España, Madrid
Alexandre Mathis: Affiliation:
SIMC, Banco de España, Madrid
Arnold Zellner: Affiliation:
University of Chicago
Franz C. Palm: Affiliation:
Universiteit Maastricht, Netherlands

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Summary

Through the encompassing principle, univariate ARIMA analysis could provide an important tool for diagnosis of VAR models. The univariate ARIMA models implied by the VAR should explain the results from univariate analysis. This comparison is seldom performed, possibly due to the paradox that, while the implied ARIMA models typically contain a very large number of parameters, univariate analysis yields highly parsimonious models. Using a VAR application to six French macroeconomic variables, it is seen how the encompassing check is straightforward to perform, and surprisingly accurate.

Introduction

After the crisis of traditional structural econometric models, a particular multivariate time series specification, the Vector Autoregression or VAR model has become a standard tool used in testing macroeconomic hypotheses. Zellner and Palm (1974, 1975) showed that the reduced form of a dynamic structural econometric model has a multivariate time series model expression, and that this relationship could be exploited empirically as a diagnostic tool in assessing the appropriateness of a structural model. As Hendry and Mizon (1992) state, a well-specified structural model should encompass the results obtained with a VAR model; similar analyses are also found in Monfort and Rabemananjara (1990), Clements and Mizon (1991), and Palm (1986).

It is also well known that a multivariate time series model implies a set of univariate models for each of the series. Thus, as argued by Palm (1986), univariate results can, in turn, provide a benchmark for multivariate models, and should be explained by them.

Type: Chapter
Information: The Structural Econometric Time Series Analysis Approach , pp. 418 - 454

DOI: https://doi.org/10.1017/CBO9780511493171.013 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2004

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