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Basic Analysis and Graphing - SAS

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478 Creating Tree Maps Chapter 19<br />

Additional Examples of the Tree Map Platform<br />

Figure 19.11 OZONE Levels for Selected Cities<br />

From Figure 19.11, you observe the following:<br />

• Los Angeles has a high level of ozone. It is also a western state, <strong>and</strong> that is reflected by its positioning in<br />

the tree map.<br />

• Chicago <strong>and</strong> Houston have slightly elevated ozone levels.<br />

• New York <strong>and</strong> Washington have slightly lower-than-average ozone levels.<br />

Next, examine lead levels in the selected cities. Perform the same steps as before, but substitute Lead with<br />

OZONE for the Coloring variable.<br />

Figure 19.12 Lead Levels for Selected Cities

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