The secular variation of a time series is its long-term, non-periodic variation (see Decomposition of time series). Whether a variation is perceived as secular or not depends on the available timescale: a variation that is secular over a timescale of centuries may be a segment of what is, over a timescale of millions of years, a periodic variation.
The secular variation of a time series is its long-term, non-periodic variation (see Decomposition of time series). Whether a variation is perceived as secular or not depends on the available timescale: a variation that is secular over a timescale of centuries may be a segment of what is, over a timescale of millions of years, a periodic variation.
Source: Wikipedia "Secular variation" · CC BY-SA 4.0
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