Example of Capability Analysis | JMP 13.2

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Basic Analysis • Distributions • Additional Examples of the Distribution Platform • Example of Capability Analysis

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Example of Capability Analysis

Suppose you want to characterize the abrasion levels of the tires your company manufactures. The lower and upper specification limits are 100 and 200, respectively.

1.

Select Help > Sample Data Library and open Quality Control/Pickles.jmp.

2.

Select Analyze > Distribution.

3.

Select Acid and click Y, Columns.

4.

5.

From the red triangle menu next to Acid, select Capability Analysis.

6.

Type 8 for the Lower Spec Limit.

7.

Type 17 for the Upper Spec Limit.

8.

Keep the rest of the default selections, and click OK.

9.

From the red triangle menu next to Acid, select Histogram Options > Vertical.

Example of the Capability Analysis Report

The spec limits are added to the histogram so that the data can be visually compared to the limits. As you can see, some of the acidity levels are below the lower spec limit, and some are very close to the upper spec limit. The Capability Analysis results are added to the report. The CPK value is 0.510, indicating a process that is not capable, relative to the given specification limits.

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Help created on 9/19/2017