A double generally weighted moving average exceedance control chart

dc.contributor.authorMasoumi Karakani, Hossein
dc.contributor.authorHuman, Schalk William
dc.contributor.authorVan Niekerk, Janet
dc.date.accessioned2018-11-01T12:02:00Z
dc.date.issued2019-02
dc.description.abstractSince the inception of control charts by W. A. Shewhart in the 1920s, they have been increasingly applied in various fields. The recent literature witnessed the development of a number of nonparametric (distribution‐free) charts as they provide a robust and efficient alternative when there is a lack of knowledge about the underlying process distribution. In order to monitor the process location, information regarding the in‐control (IC) process median is typically required. However, in practice, this information might not be available due to various reasons. To this end, a generalized type of nonparametric time‐weighted control chart labeled as the double generally weighted moving average (DGWMA) based on the exceedance statistic (EX) is proposed. The DGWMA‐EX chart includes many of the well‐known existing time‐weighted control charts as special or limiting cases for detecting a shift in the unknown location parameter of a continuous distribution. The DGWMA‐EX chart combines the better shift detection properties of a DGWMA chart with the robust IC performance of a nonparametric chart, by using all the information from the start until the most recent sample to decide if a process is IC or out‐of‐control. An extensive simulation study reveals that the proposed DGWMA‐EX chart, in many cases, outperforms its counterparts.en_ZA
dc.description.departmentStatisticsen_ZA
dc.description.embargo2020-02-01
dc.description.librarianhj2018en_ZA
dc.description.urihttp://wileyonlinelibrary.com/journal/qreen_ZA
dc.identifier.citationMasoumi Karakani H, Human SW, van Niekerk J. A double generally weighted moving average exceedance control chart. Qual Reliab Engng Int . 2019;35:224 – 245. https:// doi.org/10.1002/qre.2393.en_ZA
dc.identifier.issn0748-8017 (print)
dc.identifier.issn1099-1638 (online)
dc.identifier.other10.1002/qre.2393
dc.identifier.urihttp://hdl.handle.net/2263/67125
dc.language.isoenen_ZA
dc.publisherWileyen_ZA
dc.rights© 2018 John Wiley & Sons, Ltd. This is the pre-peer reviewed version of the following article: A double generally weighted moving average exceedance control chart. Quality and Reliability Engineering International, vol. 35, pp. 224-245, 2019. doi : 10.1002/qre.2393. The definite version is available at http://wileyonlinelibrary.com/journal/qre.en_ZA
dc.subjectStatistical process control (SPC)en_ZA
dc.subjectDouble generally weighted moving average (DGWMA)en_ZA
dc.subjectExceedance statistic (EX)en_ZA
dc.subjectAverage run length (ARL)en_ZA
dc.subjectControl charten_ZA
dc.subjectNonparametricen_ZA
dc.subjectProcess controlen_ZA
dc.subjectWeighted moving averages (WMA)en_ZA
dc.subjectProcess distributionen_ZA
dc.subjectExtensive simulationsen_ZA
dc.subjectContinuous distributionen_ZA
dc.subjectRobustness (control systems)en_ZA
dc.subjectProcess monitoringen_ZA
dc.subjectFlowchartingen_ZA
dc.subjectIntegrated circuitsen_ZA
dc.titleA double generally weighted moving average exceedance control charten_ZA
dc.typePostprint Articleen_ZA

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