Graphics Reference
In-Depth Information
Image from "Unemployment Rate: variation from the county average" ( http://warksobservatory.
files.wordpress.com/2012/07/unemployment-horizon-chart.pdf ), by Spencer
Payne/Warwickshire Observatory
To check your chosen color schemes against the potential impact of different color
deficiencies, use an application such as Vis Check ( http://vischeck.com ), which is
a free online tool to simulate what a color-blind person would see when looking at
your images.
As we've already explained in the data representation section, one of the key
functions of a visual variable is to facilitate resemblance—the discrimination of
data—and the use of color (hue) to distinguish between categorical variables is a
particularly strong aid.
In the next example, we see a project created to display the status of various
indicators surrounding how different states around the U.S. handle gay rights issues.
 
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