Bivariate choropleth maps are used to display and compare two sets of data and combines two different sets of graphic colors. These maps can portray two different sets of variables at the same time on the map. Its main purpose is to display the spatial distribution of the variables along with its geographical concentration. Overlapping of data can occur between the two variables. In this case their is an arbitrary legend that displays these colors. The map above is a comparison between the percent votes for Sen. John Kerry and the individual counties population in the 2000 elections.
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