The time series component that reflects a long-term,relatively smooth pattern or direction exhibited by a time series over a long time period is called seasonal.

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The time series component that reflects a long-term, relatively smooth pattern or direction exhibited by a time series over a long time period is called trend. Seasonal refers to patterns that repeat over a shorter time period, such as days, weeks, or months.

The Time Series Component That Reflects a Long-Term,relatively Smooth Pattern