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GCSE Statistics · key term
A set of pie charts whose circle areas are proportional to the total frequencies represented, allowing both totals and category proportions to be compared.
Used by Edexcel
Specification 2a.02 · Paper 1, Paper 2
Revise: Comparative diagrams and pie chart scalingComparative pie charts show both kinds of information. Each circle's area represents its total frequency, while the sector angles show how that total is divided. If one data set contains twice as many people as another, its circle must have twice the area—not twice the radius.
For comparative pie charts, scale the area, not the radius: multiply the radius by the square root of the total-frequency ratio.
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