A new mixed multiplicative-additive model for seasonal adjusment

Stephanus Arz

No 2006,47, Discussion Paper Series 1: Economic Studies from Deutsche Bundesbank, Research Centre

Abstract: Usually, seasonal adjustment is based on time series models which decompose an unadjusted series into the sum or the product of four unobservable components (trendcycle, seasonal, working-day and irregular components). In the case of clearly weatherdependent output in the west German construction industry, traditional considerations lead to an additive model. However, this results in an over-adjustment of calendar effects. An alternative is a multiplicative-additive mixed model, the estimation of which is illustrated using X-12-ARIMA. Finally, the relevance of the new model is shown by analysing selected time series for different countries.

Keywords: Seasonal adjustment; calendar adjustment; over-adjustment; multiplicative-additive model; X-12-ARIMA (search for similar items in EconPapers)
JEL-codes: C22 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ecm and nep-ets
Date: Written 2006
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