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u Charts
 

u Charts are a type of Attribute Control Chart used to plot the number of nonconformities per unit (rather than units nonconforming) when the sample size varies. The control limits are:

Upper Control Limit
UCL u chart
Lower Control Limit
LCL u chart

Note that the control limits are dynamic, they depend on the size of the sample.

 

The selection, design and use of control charts is covered in the MiC Quality courses Statistical Process Control and Advanced Statistical Process Control.

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