Lucas (1982) introduced a combined Shewhart-cusum scheme that is illustrated in this example. Also refer to Ryan (1989). The data set used here is CANS, which is created in "Creating a One-Sided Cusum ...

Shewhart charts are broadly classified according to the type of data analyzed. Shewhart charts for variables are used when the quality characteristic of a process is measured on a continuous scale.

Part 1 of this article series demonstrates, using real-world process data, that the four fundamental assumptions underlying the classical Shewhart control charts—randomness, independence, constant ...