Threshold of Combined Causes Example

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Quality and Process Methods • Pareto Plots • Additional Examples of the Pareto Plot Platform • Threshold of Combined Causes Example

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This example uses the Failure.jmp sample data table, which contains failure data and a frequency column. It lists causes of failure during the fabrication of integrated circuits and the number of times each type of defect occurred. A threshold value of 2 is specified for this example.

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

Select Analyze > Quality and Process > Pareto Plot.

Select failure and click Y, Cause.

Select N and click Freq.

Select Threshold of Combined Causes and then select Count.

Enter 2 as the threshold value.

Click OK.

Figure 11.8 Pareto Plot with a Threshold Count of 2

Figure 11.8 displays the plot after specifying a count of 2. All causes with counts 2 or fewer are combined into the final bar labeled 4 Others.

To separate the combined bars into original categories as shown in Figure 11.9, select Causes > Separate Causes.

Figure 11.9 Pareto Plot with Separated Causes

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Help created on 7/12/2018