A review and critique of auxiliary information-based process monitoring methods. Issue 1 (2nd January 2023)

• Record Type: Journal Article
• Authors: Saleh, Nesma A.; Mahmoud, Mahmoud A.; Woodall, William H.; Knoth, Sven
• Is Part Of: Quality technology & quantitative management. Volume 20:Issue 1(2023)
• Page Start: 1
• Page End: 20
• Publication Date: 2023-01-02
• Subjects: cause-selecting chart -- control chart -- profile monitoring -- regression-adjusted charts -- statistical process monitoring; Quality control -- Periodicals; Quality control -- Statistical methods -- Periodicals; Industrial management -- Periodicals; Industrial management; Management -- Research -- Methodology -- Periodicals; Qualitative research -- Periodicals; Management; Quality control; Quality control -- Statistical methods; Periodicals; 658.00721
• DOI: 10.1080/16843703.2022.2081903
• Languages: English
• ISSNs: 1684-3703

Abstract

ABSTRACT: We review the rapidly growing literature on auxiliary information-based (AIB) process monitoring methods. Under this approach, there is an assumption that the auxiliary variable, which is correlated with the quality variable of interest, has a known mean, or some other parameter, which cannot change over time. We demonstrate that violations of this assumption can have serious adverse effects both when the process is stable and when there has been a process shift. Some process shifts in the quality variable of interest can become undetectable. We also show that the basic AIB approach is a special case of simple linear regression profile monitoring. The AIB charting techniques require strong assumptions. Based on our results, we warn against the uncritical use of the AIB approach in quality control applications.