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p Control Charts

p Control charts are attribute type charts used to plot units nonconforming when the samples are not of equal size. This is often when samples form a natural grouping - for example the number of treatments in a hospital in a week.

 Upper Control Limit Lower Control Limit

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

If the samples sizes are of equal size an np control chart can be used.

 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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