Cu Sum Charts

A Cu Sum Chart is a control charts for variables data which plots the cumulative sum of the deviations from a target. A V-mask is often used as control limits. Because each plotted point on the Cu Sum Chart uses information from all prior samples, it detects much smaller process shifts than a normal control chart would. When not available, a Moving Average chart such as offered in our SPC software provides the same benefits.

See also:

When to Use a Cu Sum Chart

Interpreting a Cu Sum Chart

Choosing a Control Chart for Individuals Data

Learn more about the SPC principles and tools for process improvement in Statistical Process Control Demystified (2011, McGraw-Hill) by Paul Keller, in his online SPC Concepts short course (only $39), or his online SPC certification course ($350) or online Green Belt certification course ($499).