The map above is an example of a classed choropleth map. In a classed choropleth map areal units are combined into a smaller number of groups, then displayed as intervals. In the map above, there are 6 classification intervals. The map is showing the life expectancy rates of those in Africa and the Middle East. The intervals being used in this map are quantiles. To me, quantiles is a better way of averaging out the data and displaying all numerical categories.
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