Consumer Price Indices Methodology
CPI & RPI methodology & articles
What does this guide contain?
Methodological information and links to all Consumer Price Indices (CPI) and Retail Prices Index (RPI) articles published since 1998. Note that in articles and documents before December 2003, the CPI is called the Harmonised Index of Consumer Prices (HICP). Despite the name change, the CPI and HICP remain the same index.
Where can I find basic information on the CPI & RPI?
'Consumer Price Indices - A Brief Guide' describes the two main consumer price indices in the UK - the Consumer Prices Index (CPI) and the Retail Prices Index (RPI), and describes how they are compiled. It focuses on the RPI but highlights areas where the CPI differs significantly.
Where can I find more detailed information on the CPI & RPI?
The 'Consumer Price Indices Technical Manual' covers the concepts underpinning the indices, statistical methodology used, collection and validation of prices, calculation of weights, and publication and usage of the different indices.
Where can I find information on the CPI & RPI basket?
The article '2006 Basket of goods and services' explains how and why the various items in the CPI and RPI baskets are chosen.
Where can I find CPI, HICP & RPI related articles?
The 'CPI & RPI Article list' links to all articles published since 1998.
Is there any other material I may find useful?
'The New Inflation Target: the Statistical Perspective' sets out the statistical background to the Chancellor of the Exchequer's Pre-Budget Report announcement in November 2003 that the UK inflation target would be changed from one based on the Retail Prices Index excluding mortgage interest payments (PRIX) to one based on the HICP, which was renamed the Consumer Prices Index (CPI) for domestic purposes.
The article 'Summary Quality Report for Consumer Price Indices' provides information on fitness for purpose of these estimates.
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Consumer Price Indices (CPI) First Release