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Constructing U.K. Core Inflation

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Author(s): Terence C. Mills

Journal: Econometrics
ISSN 2225-1146

Volume: 1;
Issue: 1;
Start page: 32;
Date: 2013;
Original page

Keywords: core inflation | index numbers | signal extraction | time series modelling

ABSTRACT
The recent volatile behaviour of U.K. inflation has been officially attributed to a sequence of “unusual” price changes, prompting renewed interest in the construction of measures of “core inflation”, from which such unusual price changes may be down-weighted or even excluded. This paper proposes a new approach to constructing core inflation based on detailed analysis of the temporal stochastic structure of the individual prices underlying a particular index. This approach is illustrated using the section structure of the U.K. retail price index (RPI), providing a number of measures of core inflation that can be automatically calculated and updated to provide both a current assessment and forecasts of the underlying inflation rate in the U.K.
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