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Instability in cointegration regressions: a brief review with an application to money demand in Portugal

Vasco De, Vasco Gabriel, Artur Silva Lopes () and Luis Nunes ()

Applied Economics, 2003, vol. 35, issue 8, 893-900

Abstract: This study addresses some modelling questions related to the possibility of structural change in models with nonstationary variables. Focusing on cointegration issues, some methodological aspects are discussed, attempting to integrate coherently the several steps of the modelling strategy. These range from unit root to cointegration testing and to testing for instability in the cointegration vector. An empirical example with Portuguese data tries to illustrate the usefulness of this approach, where a simple money demand function is estimated using an error-correction model (ECM). If a break is explicitly allowed in the cointegration vector the forecasting performance of the ECM improves.

Date: 2003
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