A range graded proportional circle map divides data into groups, using classification procedures common to choropleth mapping. Symbol sizes are chosen for adjacent classes so the map reader can easily distinguish between categories (circles). This is a map showing the Filipino population across 13 states and the data was obtained from the 2000 US Census. It looks like a student created this for class but it is a good example of using range graded symbols to simplify a map. There are four circle sizes and the ranges look like he/she may have used natural breaks to determine the numbers. I have to wonder what the percentages reflect on this map.Link to website source:
http://www.neiu.edu/~ejhowens/377/examples.htm
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