SciELO - Scientific Electronic Library Online

 
vol.27 número1Controle on-line por atributos com erros de classificação: uma abordagem econômica com classificações repetidasSistema imunológico artificial para resolver o problema da árvore geradora mínima com parâmetros fuzzy índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Pesquisa Operacional

versão impressa ISSN 0101-7438versão On-line ISSN 1678-5142

Resumo

COSTA, Antonio F. B.  e  MACHADO, Marcela A. G.. Synthetic control charts with two-stage sampling for monitoring bivariate processes. Pesqui. Oper. [online]. 2007, vol.27, n.1, pp.117-130. ISSN 0101-7438.  http://dx.doi.org/10.1590/S0101-74382007000100007.

In this article, we consider the synthetic control chart with two-stage sampling (SyTS chart) to control bivariate processes. During the first stage, one item of the sample is inspected and two correlated quality characteristics (x;y) are measured. If the Hotelling statistic T12 for these individual observations of (x;y) is lower than a specified value UCL1 the sampling is interrupted. Otherwise, the sampling goes on to the second stage, where the remaining items are inspected and the Hotelling statistic T22 for the sample means of (x;y) is computed. When the statistic T22 is larger than a specified value UCL2, the sample is classified as nonconforming. According to the synthetic control chart procedure, the signal is based on the number of conforming samples between two neighbor nonconforming samples. The proposed chart detects process disturbances faster than the bivariate charts with variable sample size and it is from the practical viewpoint more convenient to administer.

Palavras-chave : bivariate processes; synthetic control chart; two-stage sampling.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons