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Effect of estimation under nonnormality on the phase II performance of linear profile monitoring approaches

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dc.contributor.author Aytaçoğlu, Burcu
dc.contributor.author Bayrak, Özlem Türker
dc.date.accessioned 2020-02-13T11:14:02Z
dc.date.available 2020-02-13T11:14:02Z
dc.date.issued 2019-11
dc.identifier.citation Aytacoglu, Burcu; Bayrak, Ozlem Turker, "Effect of estimation under nonnormality on the phase II performance of linear profile monitoring approaches", Quality and Reliability Engineering International, Vol. 35, No. 7, pp. 2429-2441, (2019). tr_TR
dc.identifier.issn 0748-8017
dc.identifier.uri http://hdl.handle.net/20.500.12416/2434
dc.description.abstract The number of studies about control charts proposed to monitor profiles, where the quality of a process/product is expressed as function of response and explanatory variable(s), has been increasing in recent years. However, most authors assume that the in-control parameter values are known in phase II analysis and the error terms are normally distributed. These assumptions are rarely satisfied in practice. In this study, the performance of EWMA-R, EWMA-3, and EWMA-3(d(2)) methods for monitoring simple linear profiles is examined via simulation where the in-control parameters are estimated and innovations have a Student's t distribution or gamma distribution. Instead of the average run length (ARL) and the standard deviation of run length, we used average and standard deviation of the ARL as performance measures in order to capture the sampling variation among different practitioners. It is seen that the estimation effect becomes more severe when the number of phase I profiles used in estimation decreases, as expected, and as the distribution deviates from normality to a greater extent. Besides, although the average ARL values get closer to the desired values as the amount of phase I data increases, their standard deviations remain far away from the acceptable level indicating a high practitioner-to-practitioner variability. tr_TR
dc.language.iso eng tr_TR
dc.publisher Wiley tr_TR
dc.relation.isversionof 10.1002/qre.2533 tr_TR
dc.rights info:eu-repo/semantics/closedAccess tr_TR
dc.subject Control Chart tr_TR
dc.subject Exponentially Weighted Moving Average tr_TR
dc.subject Run Length tr_TR
dc.subject Standard Deviation of Average Run Length tr_TR
dc.subject Statistical Process Control tr_TR
dc.title Effect of estimation under nonnormality on the phase II performance of linear profile monitoring approaches tr_TR
dc.type article tr_TR
dc.relation.journal Quality and Reliability Engineering International tr_TR
dc.contributor.authorID 56416 tr_TR
dc.identifier.volume 35 tr_TR
dc.identifier.issue 7 tr_TR
dc.identifier.startpage 2429 tr_TR
dc.identifier.endpage 2441 tr_TR
dc.contributor.department Çankaya Üniversitesi, İktisadi ve idari bilimler Fakültesi, İstatistik Bilim Dalı tr_TR


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