Índices de capacidade para processos multivariados independentes: extensões dos índices de niverthi e dey e mingoti e glória capability indices for independent multivariate processes: extensions of niverthi and dey's and mingoti and glória's indices
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2011
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Abstract
Neste artigo apresentamos dois novos índices de capacidade multivariados para processos independentes que são extensões do coeficiente de capacidade univariado Cpm. Esses novos índices foram formulados de acordo com as ideias de Niverthi e Dey (2000) e Mingoti e Glória (2008) e são sensíveis a diferenças entre as médias de especificação e de processo. Uma comparação entre os índices foi realizada considerando-se vários cenários diferentes e mostrou que o novo coeficiente construído com base na formulação de Mingoti e Glória teve um desempenho melhor que o fundamentado na formulação de Niverthi e Dey, embora ambos tenham se mostrado adequados para avaliar a capacidade de processos multivariados não centrados. Para construção de intervalos de confiança para o índice de capacidade real do processo foi empregada a metodologia Bootstrap. A qualidade dos estimadores dos coeficientes de capacidade foi avaliada por simulação de Monte Carlo.
In this paper we present two new capability indexes for multivariate independent processes which are extensions of the univariate capability index. These new indexes are based on approach of Niverthi and Dey (2000) and Mingoti and Gloria (2008) and they are sensitive to differences between the specification and the process means. A comparison was performed taking into account several different scenarios which showed that the index based on the Mingoti and Glória approach performed better than the index based on the Niverthi and Dey approach, although both were adequate to evaluate the capability of multivariate non-centered processes. Confidence intervals for the true capability index was built using Bootstrap methodology. The performance of the capability indexes estimators was evaluated by Monte Carlo simulation.
In this paper we present two new capability indexes for multivariate independent processes which are extensions of the univariate capability index. These new indexes are based on approach of Niverthi and Dey (2000) and Mingoti and Gloria (2008) and they are sensitive to differences between the specification and the process means. A comparison was performed taking into account several different scenarios which showed that the index based on the Mingoti and Glória approach performed better than the index based on the Niverthi and Dey approach, although both were adequate to evaluate the capability of multivariate non-centered processes. Confidence intervals for the true capability index was built using Bootstrap methodology. The performance of the capability indexes estimators was evaluated by Monte Carlo simulation.
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| Authors | ;Sueli Aparecida Mingoti;Fernando Luiz Pereira de Oliveira;Míriam Márcia Carvalho da Conceição |
| Journal | Neotropical entomology |
| Year | 2011 |
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