A bivariate choropleth map displays two variables one map, simultaneously. This is done by using two different symbols or colors/shading for each variable. This map makes it easier to observe a geographical relationship between two variables. An example of this can be seen in the map above. The two variables are the percentage of the population under 18, in red, and the percentage of rural population, in blue. By mapping them into one map, the places where they overlap are easier to observe and a relationship can be determined, if there is one. The relationship is shown by the bottom left chart.
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