http://www.geog.ucsb.edu/~jeff/gis/choropleth_maps.html
A bivariate map shows two variables on a map with the use of color or patterns in order to differentiate between the two. The map above shows two different variables. The line pattern is show to represent the states that voted for Kerry and the ones that voted for Bush. The color is shown to represent the crime rate. The crime rate is classed with the different shades of color.
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