Models for X-11 and 'X-11-Forecast' Procedures for Preliminary and Revised Seasonal Adjustments
Procedures for the season adjustment of economic time series have typically been evaluated by studying their effects on a sample of actual time series. Recent proposals for amendments and extensions to existing methods have also been evaluated in the same way. Perhaps this approach is thought to be inevitable given that "there seems to be no ideal process of evaluating a method of adjustment" (Granger, 1978, p.55). In contrast however, this paper continues a line of research in which the properties of the procedures themselves are studied, in the abstract. It is hoped that this will improve our general understanding of the performance of the existing methods and their extensions, and help explain the results of the previous empirical studies.
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