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Off topic a bit... what about those pie charts that are missing the middle. Are they proportional? Edit: seem to be called donut charts.

• callumlocke 9y ago
  With both pie charts and donut charts, the size of a segment is based on its arc length. With a pie, that's the same thing as area, but for donuts it's not. So I guess that's one argument against donut charts. Neither chart is great for comparing sizes imo. Check out https://github.com/ft-interactive/chart-doctor/tree/master/visual-vocabulary https://github.com/ft-interactive/chart-doctor/tree/master/v...
  • felixhandte 9y ago
    A donut chart is also area<->arc length proportional. Intuition: a donut chart is what remains of a pie chart when a smaller version of the same pie chart is removed from the center. If the two pie charts are proportionally correct, their difference must be proportionally correct.
    • callumlocke 9y ago
      You are right