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ArcMap Desktop: Symbolization

Symbolize variables

Change the Symbology to depict demographic data on the map.  Use the layer's Properties dialogue (right-click on the layer's name in the Table of Contents) and choose the Symbology tab.  Quantities ... Graduated Color is often useful to visualize numeric data in ranges as a choropleth map.  You will often want to normalize the value of a variable with a total for that geographic unit (e.g., divide the number of rental units per tract by the total number of housing units per tract to get a ratio).

Online help on displaying layers in general | Discussion of classification methods for graduated symbolization

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Mark Thomas
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