www.neiu.edu/~ejhowens/377/examples.htm
Proportional Cricle Maps are used by applying a formula to control the area of circles and then applying precise expansion factors. Scientists and research analysts create proportional circle maps in which the circle area reflects some attribute value. The above map shows the Mexican population in the western United States since 1990. The larger spheres represent larger populations while the smaller spheres represent smaller populations.
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