R 的時間序列預測
Rob J. Hyndman
Professor of Statistics at Monash University
| Pattern | Description |
|---|---|
| Trend | A pattern exists involving a long-term increase OR decrease in the data |
| Seasonal | A periodic pattern exists due to the calendar (e.g., the quarter, month, or day of the week) |
| Cyclic | A pattern exists where the data exhibits rises and falls that are not of fixed period (duration usually of at least 2 years) |




季節性與循環性的差異:
季節性長度固定;循環性長度可變。
循環平均長度通常比季節性更長。
循環幅度的變異性大於季節性幅度。
季節性的高峰與低谷時點可預測;循環性的長期時點則不可預測。
R 的時間序列預測