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

This 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...

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Principais autores:	Sampaio, Elvis S., Ho, Linda Lee, Medeiros, Pledson G. de
Formato:	article
Idioma:	English
Publicado em:	Quality and Reliability Engineering International
Assuntos:	Quality control Monitoring the process mean Control chart Control chart X¯ Npx control chart Combined control chart
Endereço do item:	https://repositorio.ufrn.br/handle/123456789/52057
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spelling	ri-123456789-520572023-04-05T20:58:22Z A combined npx X control chart to monitor the process mean in a two-stage sampling Sampaio, Elvis S. Ho, Linda Lee Medeiros, Pledson G. de Quality control Monitoring the process mean Control chart Control chart X¯ Npx control chart Combined control chart This 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. 2023-04-05T20:57:09Z 2023-04-05T20:57:09Z 2013-06 article SAMPAIO, 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. 2017 https://repositorio.ufrn.br/handle/123456789/52057 10.1002/qre.1528 en Acesso Aberto Quality and Reliability Engineering International
institution	Repositório Institucional
collection	RI - UFRN
language	English
topic	Quality control Monitoring the process mean Control chart Control chart X¯ Npx control chart Combined control chart
spellingShingle	Quality control Monitoring the process mean Control chart Control chart X¯ Npx control chart Combined control chart Sampaio, 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
description	This 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.
format	article
author	Sampaio, Elvis S. Ho, Linda Lee Medeiros, Pledson G. de
author_facet	Sampaio, Elvis S. Ho, Linda Lee Medeiros, Pledson G. de
author_sort	Sampaio, Elvis S.
title	A combined npx X control chart to monitor the process mean in a two-stage sampling
title_short	A combined npx X control chart to monitor the process mean in a two-stage sampling
title_full	A combined npx X control chart to monitor the process mean in a two-stage sampling
title_fullStr	A combined npx X control chart to monitor the process mean in a two-stage sampling
title_full_unstemmed	A combined npx X control chart to monitor the process mean in a two-stage sampling
title_sort	combined npx x control chart to monitor the process mean in a two-stage sampling
publisher	Quality and Reliability Engineering International
publishDate	2023
url	https://repositorio.ufrn.br/handle/123456789/52057
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A combined npx X control chart to monitor the process mean in a two-stage sampling

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