Appendix D: Trend and Seasonality Definitions
A Trend is a general systematic linear or nonlinear component that changes over time and does not repeat. The following graph shows the result of the Holt Exponential method applied to an overall trend component.
The Seasonality or seasonal cycle of a dataset is the number of points that occur in one cycle of data. Common seasonal cycles include 12 months (yearly) and three months (quarterly).