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Example map showing predominant educational attainment. Darker colors indicate stronger predominance. A brief summary of the item is not available. Add a brief summary about the item.

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Item created: Mar 3, 2015 Item updated: Jan 30, 2019 View count: 178,144

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Description

This map answers the question "What is the most common, or predominant, education level for people in this area?"  The map shows predominant educational attainment in each census tract.  Darker colors indicate a greater gap between the predominant group and the next largest group.

The U.S. Census Bureau asks citizens to indicate how far they went in formal education. The database includes seven different columns, each representing a count of population by that education level. A simple routine in compares the seven columns of information, and finds which one has the highest value, writing that to a string field. Each tract's transparency is set by a transparency field added to the data.

Predominance maps can be created in ArcGIS Online by adding two fields, calculating their values, and setting up the renderer based on those two fields.

See this blog by Jim Herries for details on how to create a predominance map in ArcGIS Online from any feature layer.

See this GitHub repo by Jennifer Bell for a script you can run in ArcMap as a script tool, to calculate predominance for any columns of data you have.

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          Esri, U.S. Census Bureau

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