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Pie chart
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===Spie chart=== [[Image:Spie_chart_001.png|thumb|left|A spie chart comparing number of students with student costs across four different schools]] A variant of the polar area chart is the spie chart, designed by Dror Feitelson.<ref name="spie">{{cite web|url=http://www.cs.huji.ac.il/~feit/papers/Spie03TR.pdf|title=Feitelson, Dror (2003) Comparing Partitions With Spie Charts|year=2003|access-date=2010-08-31}}</ref> The design superimposes a normal pie chart with a modified polar area chart to permit the comparison of two sets of related data. The base pie chart represents the first data set in the usual way, with different slice sizes. The second set is represented by the superimposed polar area chart, using the same angles as the base, and adjusting the radii to fit the data. For example, the base pie chart could show the distribution of age and gender groups in a population, and the overlay their representation among road casualties. Age and gender groups that are especially susceptible to being involved in accidents then stand out as slices that extend beyond the original pie chart.
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