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- Title
Approximate design and performance of the robust control charts for monitoring dispersion in Phase I.
- Authors
Saghir, Aamir; Faraz, Alireza
- Abstract
Abstract: This article designs and studies the approximate performance of robust dispersion charts, namely, MAD chart, Sn chart, and Qn chart, in Phase I analysis (recently developed in the literature). The proposed limits are based on false alarm probability for monitoring the dispersion of a process in Phase I analysis. The charting constants are determined to achieve the required nominal FAP (FAP0). The performance of these structures is evaluated in (i) the attained false alarm rate and (ii) the probability of signals for out‐of‐control situations. The analysis shows that the proposed design of Phase I robust dispersion charts correctly controls the FAP and shows a good performance in detecting the shifts in the process variation. An illustrative example is used to explain the practical implementation of these limits.
- Subjects
FALSE alarms; ROBUST control; AUTOMATIC control systems; QUALITY control charts; ERRORS
- Publication
Quality & Reliability Engineering International, 2018, Vol 34, Issue 2, p175
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.2246