A continuously variable proportional circle map compares different values of a particular variable by representation of different sized circles. A small circle, for instance, would represent a smaller sized population on a population map while a larger circle would represent a larger population on the same map. This visual comparison method makes it simple to see how areas compare to each other at a glance. The map displayed here shows the number of foreign born Irish present in the Western United States in the year 2000. Utah has a small circle valued at 1,000 Irish while California has a very large circle totaling to 21,000 Irish present in the study.
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