Most monthly and quarterly economic series produced by ONS are published as seasonally adjusted series. Consumer price index series have up to now been an exception. There are good reasons, discussed in this article, why RPI should not be seasonally adjusted, at least not officially by ONS. However, these reasons are not thought to apply to RPIY. Seasonally adjusted RPIY (SARY) will in future be published each month. This article discusses the issues involved.
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