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choropleth map

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choropleth map

Map on which the average numerical value of some aspect of an area (for example, unemployment by county) is indicated by a scale of colours or isoline shadings. An increase in average value is normally shown by a darker or more intense colour or shading. Choropleth maps are visually impressive but may mislead by suggesting sudden changes between areas.



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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.
Annual temperature range time-series trends and long-range forecasting by Snow, Mary M. / National Weather Digest
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.
Statistical methods for linking health, exposure, and hazards by Hartley, William Ralph / Environmental Health Perspectives
A choropleth map uses shades or colors to demonstrate the geographic distribution of a range of values.
HIV epidemic among young Thai men, 1991-2000. (Dispatches) by Brown, Arthur E. / Emerging Infectious Diseases
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