Statistical Process Control: Control Charts for Proportions (p-chart)

This video explains how to calculate centreline, lower control limit, and upper control limit for the p-chart. Equal and unequal sample sizes are discussed.

How to Construct a Control Chart in Excel:

See also

c-chart

x-bar chart

R-chart

[maracuja]

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[iLykeCahrs]

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[ThanosSiozos]

I appreciate your presentation here. When you have different sample sizes n(i) you should adjust the UCL LCL by dividing not by nbar under the root but by the specific n(i) sample size. So UCL/LCL should change with every new sample. In fact they are mirrored around the pbar value.

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[lildennys]

The UCL and LCL will vary when the sample sizes are not the same. In other words, the control limits have to be calculated for each individual proportion (p) based the sample size for that observation (n).

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[nadianursyuhaidah]

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[christopheryong]

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Thank You

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[lilawolfe]

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