A simplified procedure for the economic design of X¯ -charts

SUMMARY

A simple procedure for selecting the optimal economic design of an X¯ control chart for a single assignable cause system is presented that can be applied at the workshop level. The procedure only consists of solving an explicit equation for h (sampling interval) in terms of n (sample size) and k (control limit factor). We conclude that our model is not only more accurate, more applicable, and more flexible, but also simpler to solve than those of Duncan's model (1956), Goel et al.'s model (1968) and Chiu and Wetherill's model (1974).

Additional information

Notes on contributors

KUN-JEN CHUNG

This research was supported by the National Science Council of the Republic of China.