CUSUM chart

cumulative sum control chart

Accumulates the deviations from the target above a slack value k and signals when the sum exceeds the decision interval h. Like EWMA it is designed to detect small sustained shifts of 0.5 to 1.5 sigma.

Calculate it

Process Capability & Control Charts: Cp, Cpk, Pp, Ppk, PPM and confidence intervals with X-bar/R, X-bar/S or I-MR charts and all 8 Nelson rules.

Related terms

• EWMA chart: exponentially weighted moving average chart