Sunday, December 5, 2010

Bivariate choropleth

http://www.cartogrammar.com/blog/indiemapper-is-here/
A bivariate choropleth map uses two sets of data, or variables, to color one map based on their correlation. This map, from a site discussing a mapmaking program, shows on the top left a set of data points based on two variables. States are colored based on where the two variables converge in the graph, and thus show the convergence of both variables.

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