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Activity Number: 450
Type: Topic Contributed
Date/Time: Wednesday, August 1, 2012 : 8:30 AM to 10:20 AM
Sponsor: Business and Economic Statistics Section
Abstract - #306247
Title: Moving from X-12-Arima to X-13Arima-Seats: The UK Experience
Author(s): Gary Brown*+ and Daniel Ayoubkhani
Companies: Office for National Statistics and Office for National Statistics
Address: Governement Buildings, Newport, Gwent, NP10 8XG, United Kingdom
Keywords: Seasonal adjustment ; Office for National Statistics ; X-12-ARIMA ; X-13ARIMA-SEATS

In 2011, the UK Government Statistical Service launched a task force to consider the impact of moving from X-12-ARIMA to X-13ARIMA-SEATS on outputs and hence users of UK statistics. The remit of the task force was to quality assure the results from seasonally adjusting and forecasting a range of time series - especially problematic types - using both software packages. The task force consisted of members from seven government departments, and the three devolved administrations of Wales, Scotland and Northern Ireland. Alongside the recommendation to change software, the task force recommended a two year training programme across the UK in the use of the new software for seasonal adjustment. This paper takes the reader through the process of evaluation, the wider assessment of requirements for training, to the mechanisms set-up to improve seasonal adjustment practice across the UK.

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