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- Title
Monitoring of time between events with a double generally weighted moving average control chart.
- Authors
Alevizakos, Vasileios; Koukouvinos, Christos; Lappa, Angeliki
- Abstract
Monitoring of time between events (TBE) instead of the number of events is used in high‐quality processes where the events occur rarely. This article presents a double generally weighted moving average control chart with a lower time‐varying control limit to monitor the TBE (regarded as DGWMA‐TBE chart). The design parameters of the proposed chart are provided, and through a simulation study, it is shown that the DGWMA‐TBE chart is more effective than the DEWMA and GWMA charts in detecting moderate to large shifts. Furthermore, the DGWMA‐TBE chart is very robust for the same range of shifts when the TBE observations follow a Weibull or a lognormal distribution. Finally, examples are also presented to enhance the performance of the proposed chart.
- Subjects
TIME measurements; QUALITY control charts; ROBUST statistics; WEIBULL distribution; GAMMA distributions
- Publication
Quality & Reliability Engineering International, 2019, Vol 35, Issue 2, p685
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.2430