c-chart Example | JMP 13.2

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Quality and Process Methods • Control Chart Builder • Additional Examples of the Control Chart Builder • c-chart Example

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c-chart Example

The Cabinet Defects.jmp sample data table contains data concerning the various defects discovered while manufacturing cabinets over two time periods.

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

Select Analyze > Quality and Process > Control Chart Builder.

Drag Type of Defect to the Y role.

Drag Lot Number to the Subgroup role.

A np-chart of Type of Defect appears.

To change to a c-chart, select Poisson from the Sigma list.

Open the Type of Defect disclosure button. Note that all of the defect types are listed, but only Bruised veneer is selected and displayed in the chart. You can select additional defect types and the chart updates immediately.

c-chart of Type of Defect

To add to phase variable, drag Date to the Phase zone.

c-chart of Type of Defect with Phases

You can now view the results on the two different days. Both appear to be within limits. To examine other defect type behavior, select another defect type under the Event Chooser and view the results as the limits are updated.

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Help created on 9/19/2017