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GCSE Statistics · key term
The reference year against which other years are compared; its index number is 100.
Used by AQA
Specification 3.5.18 · Paper 1, Paper 2
Revise: Index NumbersThe reference period, often called the base year, is assigned an index of 100. This makes changes easier to compare without needing to work with the original prices or quantities.
Identify the reference period before calculating: a fixed base year and the previous month or year are different comparisons.
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