The Modeling and Seasonal Adjustment of Weekly Observations

Andrew Harvey, Siem Jan Koopman and Marco Riani

Journal of Business & Economic Statistics, 1997, vol. 15, issue 3, 354-68

Abstract: Several important economic time series are recorded on a particular day every week. Seasonal adjustment of such series is difficult because the number of weeks varies between 52 and 53 and the position of the recording day changes from year to year. In addition certain festivals, most notably Easter, take place at different times according to the year. This article presents a solution to problems of this kind by setting up a structural time series model that allows the seasonal pattern to evolve over time and enables trend extraction and seasonal adjustment to be carried out by means of state-space filtering and smoothing algorithms. The method is illustrated with a Bank of England series on the money supply.

Date: 1997
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