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GCSE Statistics · key term
The position of a value when a set of values is placed in order.
Used by Edexcel
Specification 2e.05, 2e.06 · Paper 1, Paper 2
Revise: Spearman's rank correlationA rank is a value's position in an ordered list. Replacing scores with ranks means that the calculation uses their order, not the numerical gaps between them.
A position in an ordered list of values or competitors, such as first, second or third.
Rank both variables in the same direction: either highest = 1 for both or lowest = 1 for both.
Calculate differences between ranks, not between the original values. Square each difference before adding: Σd² is not (Σd)².
The formula is provided on the formulae sheet, and tied ranks will not be tested.
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