ST8 · H: extensions 1 / H: extensions 2 Time series, index numbers and rates mind map
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H: extensions 1
Higher: Other periods and centring: Match period; centre even moving averages if needed.
Higher: Mean seasonal effect: Average actual − trend for each season.
Higher: Seasonal prediction: Forecast = trend + mean seasonal effect.
Higher: Weighted index: Weighted index = ΣwI ÷ Σw.
H: extensions 2
Higher: Chain-based index: Multiply link factors across successive periods.
Higher: Standardisation: Common population basis improves rate comparisons.
Connections
H: extensions 1 → H: extensions 2: Additive seasonal forecasts and chain indices use distinct models whose assumptions must be checked.
