Basic Analysis and Graphing - SAS

Chapter 19 Creating Tree Maps 479
Additional Examples of the Tree Map Platform
From Figure 19.12, you observe the following:
• Cleveland and Seattle have high levels of lead. Cleveland is near the middle of the country, and Seattle is
in the northwest. These locations are reflected by their positioning in the tree map.
• Interestingly, most other cities have rather low lead levels.
• Raleigh and Phoenix have missing values for lead measurements.
Examine Causes of Failure
This example uses the Failure3.jmp sample data table, which contains the common causes of failure during
the fabrication of integrated circuits. Examine the causes of failure and when it occurs.
1. Open the Failure3.jmp sample data table, located in the Quality Control folder.
2. Select Graph > Tree Map.
3. Select N and click Sizes.
4. Select failure and clean and click Categories.
5. Select clean and click Coloring.
6. Click OK.
The report window appears.
Figure 19.13 Failure Modes
From Figure 19.13, you observe the following:
• Contamination is the biggest cause of failure.
• Contamination occurs more often before the circuits were cleaned, rather than after they were cleaned.