Category:Cusum Charts

This category contains results about Cusum Charts.
Definitions specific to this category can be found in Definitions/Cusum Charts.

A cusum chart is a control chart designed to detect departure from acceptable operating standards.

A record is kept of the sum of deviations from an ideal target value for successive samples.

While the process is in control, the cumulative sum of deviations should remain small, because positive and negative deviations are expected to cancel each other out.

Hence, a run of samples in which either positive or negative deviations dominate indicates that the process may be out of control.

Cusum charts are specifically designed so as to make it easy for operatives to make a routine decision as to whether the process is out of control.