A p chart is an attribute control chart that displays changes in the percentage or proportion of defective products, rejects or unacceptable outcomes. It is an indicator of the consistency and predictability of the level of defects in the process.
Since a p chart is used when the subgroup size varies, the chart plots the proportion or fraction of items rejected, rather than the number rejected. This is indicated by the shifting UCL and LCL lines that depend on the size of the subgroup. For each subgroup, the proportion rejected is calculated as the number of rejects divided by the number of items inspected. When you have a constant subgroup size, use an np chart instead.
To create a P chart: • In Statit Express QC click on the “p” button on the menu bar. • In Statit Custom QC:
Select: QC Attribute charts P Chart The dialogs lead you through the creation of the charts.
If you have any difficulties, open the Help file using the Help button on the P Chart dialog, or select Help Contents and find “P Chart” in the Index.
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