2015s-35
Seasonal adjustment with and without revisions: A comparison of
X-13ARIMA-SEATS and CAMPLET Barend Abeln, Jan P.A.M. Jacobs
Série Scientifique/Scientific Series
Montréal Juillet/July 2015
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Série Scientifique Scientific Series
2015s-35
Seasonal adjustment with and without revisions: A comparison of
X-13ARIMA-SEATS and CAMPLET
Barend Abeln, Jan P.A.M. Jacobs
CIRANO
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Partenaire financier
Seasonal adjustment with and without revisions: A comparison of
X-13ARIMA-SEATS and CAMPLET *
Barend Abeln
†, Jan P.A.M. Jacobs
‡Résumé/abstract
Seasonality in macroeconomic time series can obscure movements of other components in a series that are operationally more important for economic and econometric analyses. Indeed, in practice one often prefers to work with seasonally adjusted data to assess the current state of the economy and its future course. Recently, two most widely used seasonal adjustment methods, Census X-12-ARIMA and TRAMO-SEATS, merged into X-13ARIMA-SEATS to become a new industry standard. In this paper, we compare and contrast X-13ARIMA-SEATS with a seasonal adjustment program called CAMPLET, an acronym of its tuning parameters. CAMPLET consists of a simple adaptive procedure which separates the seasonal component and the non-seasonal component from an observed time series. Once this process has been carried out there will be no need to revise these components at a later stage when more observations become available, in contrast with other seasonal adjustment methods. The paper briefly reviews of X-13ARIMA-SEATS and describes the main features of CAMPLET. We evaluate the outcomes of both methods in a controlled simulation framework using a variety of processes. Finally, we apply the X-13ARIMA-SEATS and CAMPLET methods to three time series: U.S. non-farm payroll employment, operational income of Ahold, and real GDP in the Netherlands.
Mots clés/keywords : seasonal adjustment, real-time, seasonal pattern, simulations, employment, operational income, real GDP.
Codes JEL/JEL Codes : C22; E24; E32; E37
*We would like to thank Pim Ouwehand for computational assistance and discussion, Dean Croushore and Jan De Gooijer for helpful suggestions, and participants at the Conference in Honour of Denise R. Osborn, Manchester, April 2014, in particular Farshid Vahid, a seminar at KOF Zurich, June 2014, the International Seminar of Forecasting, Rotterdam, June 2014, the 8th International Conference on Computational and Financial Econometrics (CFE 2014), University of Pisa, Italy, December 2014, and the 13th Conjunctuurdag, February 2015, The Hague for helpful comments.
† Private investment consultant.
‡ University of Groningen, University of Tasmania, CAMA and CIRANO. Correspondence to Jan P.A.M.
Jacobs, Faculty of Economics and Business, University of Groningen, P.O. Box 800, 9700 AV GRONINGEN, the Netherlands. Tel.: +31 50 363 3681. Email: j.p.a.m.jacobs@rug.nl
