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Measurement of Seasonal Items within the Consumer Prices Index and Retail Prices Index (2010)

Opening date: 01 October 2010
Closing date: 23 December 2010
Department: Office for National Statistics
Category: General

The UK Statistics Authority has decided to implement a change recommended by the National Statistician’s Consumer Prices Advisory Committee (CPAC).

This change relates to the measurement methods used for seasonal items within the Consumer Prices Index (CPI) and Retail Prices Index (RPI).

CPAC recommended:

a. The Office for National Statistics (ONS) changes the method used to measure seasonal items in the CPI and RPI from the ‘carrying the index forward’ approach to an improved imputation based method
b. The new method should be introduced from the January 2011 CPI and RPI published on 15 February 2011

This decision follows a period of public consultation that took place on these proposals between 1 October 2010 and 23 December 2010 in line with the National Statistics Code of Practice. An assessment of the change was also conducted by the Bank of England under the provisions of the relevant part of the Statistics and Registration Service Act 2007. 

The improved method will first be used in the construction of the January 2011 CPI and RPI, published on 15 February 2011. 

The response to the public consultation, which also includes the assessment of the change by the Bank of England, can be found under the downloads section.

Comments should be sent to:

Darren Morgan
Room 1227
Office for National Statistics
Government Buildings
Cardiff Road
NP10 8XG

+44 (0)1633 455 666


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