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choropleth map

   Also found in: Wikipedia, Hutchinson 0.07 sec.
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Noun1.choropleth map - a map that uses graded differences in shading or color or the placing of symbols inside defined areas on the map in order to indicate the average values of some property or quantity in those areas
map - a diagrammatic representation of the earth's surface (or part of it)


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Figure 3 is a choropleth map for the period 1951-1980 that indicates an increase in the ATR across much of the continental United States.
The microplot map (NCI 2004c) shows 95% confidence intervals for the units, and their intervals may overlap even though a choropleth map indicates a difference.
A choropleth map uses shades or colors to demonstrate the geographic distribution of a range of values.
 
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