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- Title
A hybrid homogeneously weighted moving average control chart for process monitoring: Discussion.
- Authors
Malela-Majika, Jean-Claude; Shongwe, Sandile Charles; Adeoti, Olatunde Adebayo
- Abstract
The sensitivity of a monitoring scheme depends on many factors including the variance of the charting statistic which is very important in the computation of the control limits. This paper discusses the computation of the variance of the recently proposed hybrid homogeneously weighted moving average (HHWMA) XÌ„ scheme which was based on an incorrect assumption. The correct variance is used to evaluate the run-length characteristics of the HHWMA XÌ„ scheme. It is observed that the incorrect variance has a significant impact on the sensitivity (or performance) of the HHWMA XÌ„ scheme. The sensitivity of a monitoring scheme depends on many factors including the variance of the charting statistic which is very important in the computation of the control limits. This paper discusses the computation of the variance of the recently proposed hybrid homogeneously weighted moving average (HHWMA) X̄ scheme which was based on an incorrect assumption. The correct variance is used to evaluate the run-length characteristics of the HHWMA X̄ scheme. It is observed that the incorrect variance has a significant impact on the sensitivity (or performance) of the HHWMA X̄ scheme.
- Subjects
MOVING average process; QUALITY control charts
- Publication
Quality & Reliability Engineering International, 2021, Vol 37, Issue 8, p3314
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.2911