Run Length Variability and Three Sigma Control Limits

Govindaraju K. and Lai C. D.
Additional contact information
Govindaraju K.: Institute of Information Sciences and Technology, Massey University, Palmerston North, New Zealand. k.govindaraju@massey.ac.nz
Lai C. D.: Institute of Information Sciences and Technology, Massey University, Palmerston North, New Zealand. c.lai@massey.ac.nz

Stochastics and Quality Control, 2004, vol. 19, issue 2, 175-184

Abstract: This article provides an argument against the use of three sigma limits for control charts. An alternative proposal to use control limits narrower than three sigma control limits is made. The main reason for narrowing the control limits is to achieve a smaller variability in the frequency of process resetting as well as false alarms. An example is given illustrating why a good statistical design of control charts needs to avoid the use of three sigma control limits.

Keywords: Average Run Length; Control Chart; Three Sigma Limit (search for similar items in EconPapers)
Date: 2004
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Citations: View citations in EconPapers (2)

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DOI: 10.1515/EQC.2004.175

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