Secular Variation
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High Quality Content by WIKIPEDIA articles! The secular variation (also secular trend or secular drift) of a time series is its long-term non-periodic variation, as opposed to its periodic variation. Of course, whether something is perceived as a secular variation or not depends on the available timescale: what appears to be a secular variation over a time scale of centuries can turn out to be a periodic variation over a time scale of millions of years. Natural quantities often have both periodic and secular variations.

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High Quality Content by WIKIPEDIA articles! The secular variation (also secular trend or secular drift) of a time series is its long-term non-periodic variation, as opposed to its periodic variation. Of course, whether something is perceived as a secular variation or not depends on the available timescale: what appears to be a secular variation over a time scale of centuries can turn out to be a periodic variation over a time scale of millions of years. Natural quantities often have both periodic and secular variations.