Australian & New Zealand Journal of Statistics
Applications: The Surrogate Henderson Filters in X‐11
Journal Article
- Author(s): Mike Doherty
- Article first published online: 18 Dec 2002
- DOI: 10.1111/1467-842X.00187
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This paper explains the surrogate Henderson filters that are used in the X‐11 variant of the Census Method II seasonal adjustment program to obtain trends at the ends of time series. It describes a prediction interpretation for these surrogate filters, justifies an approximation to the filters, proposed by Kenny & Durbin (1982), and proposes a further interpretation of the results. The starting point for the paper is unpublished work by Musgrave (1964a, 1964b). His work has continuing relevance to current seasonal adjustment practice. This paper makes that work generally available for the first time, and reviews and extends it.
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