A range graded proportional circle map is a proportional circle map that depicts the circles in relation to ranges of data. The information is classified as equal quantiles, breaks, natural breaks, and minimum variance. This shows the population of American Indians by location (in the thousands). The bigger the circle, the bigger the population of American Indians in that location.http://www.neiu.edu/~smkope/387/BasicPage/Proportional%20Circle%20Map.jpg
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