Methods and formulas for graphs in Binomial Capability Analysis

P Chart

For information on the methods used to create the P chart, go to Methods and formulas for P Chart.

Cumulative %Defective

The number of plotted points equals the number of samples in your study.

The cumulative % defective for the jth sample is calculated as follows:

The reference lines on the plot are calculated as follows:

For more information on the confidence bounds, go to Methods and formulas for confidence intervals and bounds.


DiNumber of defectives in the ith sample
NiThe ith sample size