Treemaps

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Essential Graphing • Treemaps

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View Multi-Level Categorical Data in a Rectangular Layout

Treemaps are useful for observing patterns among groups that have many levels. Treemaps are like bar charts that have been folded over in two dimensions so that there is no unused space. Rather than drawing a single bar for each measurement, a treemap can show the magnitude of a measurement by varying the size or color of a rectangular area. Use treemaps when your data contains many categories, to visualize many groups.

Treemaps were named and popularized by Ben Schneiderman, who has an extensive website about the idea (http://www.cs.umd.edu/hcil/treemap-history/index.shtml)

Figure 10.1 Example of a Treemap

Contents

Example of Treemaps

Example using the Treemap Platform

Example using Graph Builder

Launch the Treemap Platform

The Treemap Window

Treemap Platform Options

Additional Examples of the Treemap Platform

Example Using a Sizes Variable

Example Using an Ordering Variable

Example Using Two Ordering Variables

Example of a Continuous Coloring Variable

Example of a Categorical Coloring Variable

Example of Squarifying Data

Examine Pollution Levels

Examine Causes of Failure

Examine Patterns in Car Safety

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Help created on 7/12/2018