An observed time series can be decomposed into three components: the trend (long term direction), the seasonal (systematic, calendar related movements) and the irregular (unsystematic, short term fluctuations) .
Read moreWhat are the 4 components of time series in statistics?
Let Y t be a time series that can be decomposed with the help of these four components: Secular trend T . Seasonal variations S. Cyclical fluctuations C.
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