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The '''secular variation''' of a [[time series]] is its long-term non-periodic variation (see [[Decomposition of time series]]). Whether something is perceived as a secular variation or not depends on the available timescale: a secular variation over a time scale of [[Century|centuries]] may be part of a [[periodic variation]] over a time scale of millions of years. Natural quantities often have both periodic and secular variations. Secular variation is sometimes called '''secular trend''' or '''secular drift''' when the emphasis is on a linear long-term trend.
==Examples==
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