p-chart formulas
The p formula (for the proportion of nonconforming units from subgroups that can vary in size):
To calculate control limits for the p-chart:
Quality Advisor
A free online reference for statistical process control, process capability analysis, measurement systems analysis, and control chart interpretation, and other quality metrics.
The p formula (for the proportion of nonconforming units from subgroups that can vary in size):
To calculate control limits for the p-chart: