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Basic Analysis and Graphing - SAS

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Chapter 19<br />

Creating Tree Maps<br />

Using the Tree Map Platform<br />

Tree maps are useful for observing patterns among groups that have many levels. Tree maps are like bar<br />

charts that have been folded over in two dimensions so that there is no unused space. Rather than drawing a<br />

single bar for each measurement, a tree map can show the magnitude of a measurement by varying the size<br />

or color of a rectangular area. Use tree maps when your data contains many categories, to visualize many<br />

groups.<br />

Tree maps were named <strong>and</strong> popularized by Ben Schneiderman, who has an extensive Web site about the<br />

idea (http://www.cs.umd.edu/hcil/treemap-history/index.shtml)<br />

Figure 19.1 Example of a Tree Map

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