A combined npx X control chart to monitor the process mean in a two-stage sampling

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dc.contributor.authorSampaio, Elvis S.
dc.contributor.authorHo, Linda Lee
dc.contributor.authorMedeiros, Pledson G. de
dc.date.accessioned2023-04-05T20:57:09Z
dc.date.available2023-04-05T20:57:09Z
dc.date.issued2013-06
dc.description.resumoThis paper proposes a new combined npx X control chart for monitoring the mean of a process. A sample of size n is split into two sub-samples of sizes n1 and n2 =n-n1, determined by an optimization search. The units of the first sub-sample are evaluated by attributes and plotted on an npx control chart. If this chart signals an out-of-control condition, then values of the quality characteristic of interest are collected from the units of the second sub-sample, and the sample mean is calculated and plotted on an X control chart. If both control charts signal, then the process is halted for adjustment. The possibility that all n items will not be inspected may lead to a reduction in both the cost and time spent on examining the sampled items. The performance of the proposed procedure is compared to that of two separate X and npx control charts. The proposed procedure exhibits superior performance to the X control chart for a variety of sample sizes, n, and shifts, d, of the target mean. The average time to signal (ATS) for the combined control chart was lower than that calculated for a single X or npx control chart, indicating that the combined control chart is an efficient tool for monitoring the process mean.pt_BR
dc.identifier.citationSAMPAIO, Elvis S.; HO, Linda Lee; MEDEIROS, Pledson G. de. A Combined npx−X¯ control chart to monitor the process mean in a two-stage sampling. Quality and Reliability Engineering International (Print), v. 30, p. 1003-1013, 2014. Disponível em: http://onlinelibrary.wiley.com/doi/10.1002/qre.1528/abstract;jsessionid=422BA9D78605B9EDDCD6ED5B9CA410E7.f03t03. Acesso em: 08 dez. 2017pt_BR
dc.identifier.doi10.1002/qre.1528
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/52057
dc.languageenpt_BR
dc.publisherQuality and Reliability Engineering Internationalpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectQuality controlpt_BR
dc.subjectMonitoring the process meanpt_BR
dc.subjectControl chartpt_BR
dc.subjectControl chart X¯pt_BR
dc.subjectNpx control chartpt_BR
dc.subjectCombined control chartpt_BR
dc.titleA combined npx X control chart to monitor the process mean in a two-stage samplingpt_BR
dc.typearticlept_BR

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