P Control Chart (Proportion Nonconforming) Online
Online p chart tool: enter the number inspected and number nonconforming for each subgroup to automatically calculate p̄ and the subgroup-specific UCL/LCL, with out-of-control detection using the eight GB/T 4091 rules.
What is the difference between a p chart and an np chart?
A p chart monitors the proportion nonconforming and allows varying subgroup sizes, so the control limits change with subgroup size; an np chart monitors the number of nonconforming units and requires a constant subgroup size.