u-chart Example | JMP 13.2

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Quality and Process Methods • Shewhart Control Charts • Additional Examples of the Control Chart Platform • u-chart Example

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u-chart Example

The Braces.jmp data in the Quality Control sample data folder records the defect count in boxes of automobile support braces. A box of braces is one inspection unit. The number of boxes inspected (per day) is the subgroup sample size, which can vary. The u-chart in u-chart is monitoring the number of brace defects per subgroup sample size. The upper and lower bounds vary according to the number of units inspected.

Note: When you generate a u-chart, and select Capability, JMP launches the Poisson Fit in Distribution and gives a Poisson-specific capability analysis. To use the Capability feature, the unit sizes must be equal.

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

Select Analyze > Quality and Process > Control Chart > U.

Select # defects and click Process.

Select Date and click Sample Label.

Select Unit size and click Unit Size.

Click OK.

u-chart

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Help created on 9/19/2017