Methods and formulas for graphs in Poisson Capability Analysis

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

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

The cumulative DPU for the j^th sample is calculated as follows:

The reference lines on the plot are calculated as follows:

• Middle reference line: Mean DPU. For more information, go to Methods and formulas for capability statistics in Poisson Capability Analysis and click "Mean DPU".
• Upper reference line: Upper bound for the Mean DPU
• Lower reference line: Lower bound for the Mean DPU

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