A SIMPLIFIED PROCEDURE FOR THE ECONOMIC DESIGN OF CONTROL CHARTS: A UNIFIED APPROACH

Abstract

A simple procedure for selecting the optimal economic design of a control chart for a single assignable cause system is presented. The procedure consists only of solving an explicit equation for h (sampling interval) in terms of n (sample size) and L (control limit factor). We conclude that our model is not only more accurate, more applicable, and more flexible, but also simpler to solve than Lorenzen and Vance's Model³.

KEY WORDS:

• Control charts
• economic design
• production
• quality control

Additional information

Notes on contributors

KUN-JEN CHUNG

This research was supported by the National Science Council of the Republic of China (NSC80-0415-E-0I1-0I). The author wishes to thank Mr. Wei-Chung Lin who wrote the computer code for the minimization procedure of this paper