Definition: Seasonal variation

OECD - Data and Metadata Reporting

That part of the variations in a time series representing intra-year fluctuations that are repeated more or less regularly in the same period year after year.
OECD, 2004, "Some proposals for standard terminology relating to data presentation", paper presented to the OECD Short-term Economic Statistics Working Party (STESWP), 28-30 June 2004, Paris [quoted in Organisation for Economic Co-operation and Development (OECD), "Data and Metadata Reporting and Presentation Handbook", OECD, Paris, 2007]

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