| Cart Total:
Menu
Fine Tuning
  • Manufacturing, Quality, Service

Fine Tuning

Adjust control chart constants to lower false and nuisance alarm rates

Publication:
Quality Progress
Date:
September 2022
Issue:
Volume 55 Issue 9
Pages:
pp. 28-35
Author(s):
Woodall, William H., Faltin, Frederick W., Yashchin, Emmanuel
Organization(s):
Virginia Tech, Blacksburg, VA, Virginia Tech, Blacksburg, VA, IBM Thomas J. Watson Research Center, Department of Artificial Intelligence Applications, Yorktown Heights, NY.

Abstract

Control charts are used to detect process changes over time. False alarms are control chart signals when no change has occurred. Nuisance alarms are signals that a change has occurred when the change is too small to require the practitioner to act or make a decision. Reacting to false and nuisance alarms results in wasted time and unnecessary expense. Too many such alarms can destroy faith in the monitoring scheme. Practitioners are encouraged to adjust their control chart design and question the use of the usual default design constants so that the systemwide rate of false and nuisance alarms is controlled at an acceptable level, and the design of their control charts meets the requirements and risks faced in their circumstances.

ALREADY A MEMBER?    REGISTER