Continuously variable proportional circle map
According to the website where I got this image (Nina Roberts), One circle represents the number of persons of German ancestry in each community area. Four circle sizes are used, each indicating a logarithmic increase in represented data. The number of people symbolized by each circle ranges from 10 for the smallest circle to 1000 for the largest. Each circle in a continuously variable proportional circle map represents a specific set of data that is being examined in that certain area.
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