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Long-term variations in time-series data that repeat in a reasonably systematic way over time. The cyclical component can often be represented by a wave-shaped curve, which represents alternating periods of expansion and contraction. The successive waves of the curve may have different periods.
Cyclical components are difficult to analyse and at Level Eight cyclical components can be described along with the trend.
See: time-series data
Curriculum achievement objectives reference
Statistical investigation: (Level 8)
