http://proceedings.esri.com/library/userconf/proc99/proceed/papers/pap171/p171.htm
A bivariate choropleth map depicts two different variables on a single map by including two different sets of graphical colors or symbols and combining the different sets of data. The map above does a good job of showing how a bivariate map works, it shows the median house value but at the same time shows the population in 1997.
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