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10 - The use of ARIMA models in unobserved-components estimation: an application to Spanish monetary control

Published online by Cambridge University Press:  03 May 2010

William A. Barnett
Affiliation:
University of Texas, Austin
Halbert White
Affiliation:
University of California, San Diego
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Summary

Time series analysts (often “econometricians”) working in institutions involved with economic policy making or short–term economic analysis face two important professional demands: forecasting and unobserved components estimation (including seasonal adjustment). Estimation of unobserved components is overwhelmingly done in practice by using ad hoc filters; the most popular example is estimation of the seasonally adjusted series with the Xll or Xll ARIMA program.

Concerning forecasting, the decade of the seventies witnessed the proliferation of autoregressive integrated moving–average (ARIMA) models (Box and Jenkins 1970), which seemed to capture well the evolution of many series. Since this evolution is related to the presence of trend, seasonal, and noise variation, the possibility of using ARIMA models in the context of unobserved components was soon recognized. Since the early work of Grether and Nerlove (1970) on stationary series, several approaches have been suggested. I shall concentrate on one that is becoming, in my opinion, a powerful statistical tool in applied time series work [starting references are Cleveland and Tiao (1976) and Box, Hillmer, and Tiao (1978); more recent references are Bell and Hillmer (1984) and Maravall and Pierce (1987)]. In the context of an application related to the control of the Spanish money supply, I shall address the issues of model specification, estimation of the components, diagnostic checking of the results, and inference drawing.

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Dynamic Econometric Modeling
Proceedings of the Third International Symposium in Economic Theory and Econometrics
, pp. 171 - 196
Publisher: Cambridge University Press
Print publication year: 1988

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