|Page top Previous Homepage Next||
Proportional Area Chart
Great for comparing values and showing proportions (in sizes, quantities etc) to give a quick, overall view of the relative sizes of the data, without the use of scales. The downside to this chart, is that it's difficult to estimate values using area charts. This means they're almost exclusively used for communication purposes instead of analytical ones.
Proportional Area Charts usually use squares or circles, however any shape can be used, so long as you use the shape's area to represent the data. A common technical error with area charts is to use one length to determine the shape's size, when in fact you need to calculate the space inside the shape to determine its size. Otherwise you will cause exponential increases and decreases.
ExamplesEuropean Debt Crisis Information Graphic (rinodesign.co.uk)