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Xbar & R Control Charts
 

Xbar & R Control Charts are probably the most widely used type of Variable Control Charts in Statistical Process Control.

They are used as a pair, the Xbar (Mean) chart plots the mean of subgroups that are taken periodically from the process. The R (Range) chart plots the range of the subgroups. See 'Rational Subgroups' for guidance on how to select subgroups.

The control limits are calculated from:

Upper Control Limit
Upper Control Limit Xbar
Lower Control Limit
Lower Control Limit Xbar
R Charts
Upper Control Limit
Upper Control Limit R Chart
Lower Control Limit
Lower Control Limit R Chart

The factors are taken from standard tables.

 

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

Try out our courses by taking the first module of the Primer in Statistics free of charge.

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