X charts with supplementary samples to control the mean and variance
dc.contributor.author | Costa, AFB | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.date.accessioned | 2014-05-20T15:24:00Z | |
dc.date.available | 2014-05-20T15:24:00Z | |
dc.date.issued | 2000-11-10 | |
dc.description.abstract | A standard X chart for controlling a process takes regular individual observations, for instance every half hour. This article proposes a modification of the X chart that allows one to take supplementary samples. The supplementary sample is taken (and the (X) over bar and R values computed) when the current value of X falls outside the control limits. With the supplementary sample, the signal of out-of-control is given by an (X) over bar value outside the (X) over bar chart's control limits or an R value outside the R chart's control limit. The proposed chart is designed to hold the supplementary sample frequency, during the in-control period, as low as 5% or less. In this context, the practitioner might prefer to verify an out-of-control condition by simply comparing the (X) over bar and R values with the control limits. In other words, without plotting the (X) over bar and R points. The X chart with supplementary samples has two major advantages when compared with the standard (X) over bar and A charts: (a) the user will be plotting X values instead of (X) over bar and R values; (b) the shifts in the process mean and/or changes in the process variance are detected faster. | en |
dc.description.affiliation | UNESP, Dept Prod, BR-12500000 São Paulo, Brazil | |
dc.description.affiliationUnesp | UNESP, Dept Prod, BR-12500000 São Paulo, Brazil | |
dc.format.extent | 3801-3809 | |
dc.identifier | http://dx.doi.org/10.1080/00207540050176012 | |
dc.identifier.citation | International Journal of Production Research. London: Taylor & Francis Ltd, v. 38, n. 16, p. 3801-3809, 2000. | |
dc.identifier.doi | 10.1080/00207540050176012 | |
dc.identifier.issn | 0020-7543 | |
dc.identifier.uri | http://hdl.handle.net/11449/34659 | |
dc.identifier.wos | WOS:000165397900006 | |
dc.language.iso | eng | |
dc.publisher | Taylor & Francis Ltd | |
dc.relation.ispartof | International Journal of Production Research | |
dc.relation.ispartofjcr | 2.623 | |
dc.relation.ispartofsjr | 1,432 | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Web of Science | |
dc.title | X charts with supplementary samples to control the mean and variance | en |
dc.type | Artigo | |
dcterms.license | http://journalauthors.tandf.co.uk/permissions/reusingOwnWork.asp | |
dcterms.rightsHolder | Taylor & Francis Ltd |
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