Classed Choropleth Maps

The above image, taken from www.ilstu.edu/~jrcarter/Geo204/Choro/, shows a classic example of a classed choropleth map. In this case 4 classes are delineated by the four colors depicted on the map. Although individual states of the same color may not have exactly the same proportion of males to females, the proportion falls into the same class range. This can simplify the map, but at the expense of detail. Manipulating where the classes are divided can also be a tool for someone to purposely manipulate.