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A new chart based on sample variances for monitoring the covariance matrix of multivariate processes
(Springer London Ltd, 2009-04-01)
In this article, we propose a control chart for detecting shifts in the covariance matrix of a multivariate process. The monitoring statistic is based on the standardized sample variance of p quality characteristics we ...
A new chart based on sample variances for monitoring the covariance matrix of multivariate processes
(Springer London Ltd, 2009-04-01)
In this article, we propose a control chart for detecting shifts in the covariance matrix of a multivariate process. The monitoring statistic is based on the standardized sample variance of p quality characteristics we ...
Controle estatístico multivariado de processos através do gráfico T2 de Hotelling: um estudo de caso no setor de embalagens
(Universidade Tecnológica Federal do ParanáPonta GrossaBrasilDepartamento Acadêmico de Engenharia de ProduçãoEngenharia de ProduçãoUTFPR, 2017-11-24)
Multivariate analysis has been used lately as organizations have modern equipment that creates correlated data and requires simultaneous monitoring. One of the areas that deals with such problems is determined by multivariate ...
A control chart based on sample ranges for monitoring the covariance matrix of the multivariate processes
(Routledge Journals, Taylor & Francis Ltd, 2011-01-01)
For the univariate case, the R chart and the S(2) chart are the most common charts used for monitoring the process dispersion. With the usual sample size of 4 and 5, the R chart is slightly inferior to the S(2) chart in ...
A control chart based on sample ranges for monitoring the covariance matrix of the multivariate processes
(Routledge Journals, Taylor & Francis Ltd, 2011-01-01)
For the univariate case, the R chart and the S(2) chart are the most common charts used for monitoring the process dispersion. With the usual sample size of 4 and 5, the R chart is slightly inferior to the S(2) chart in ...
Multivariate quality control studies applied to Ca(II) and Mg(II) determination by a portable method
(Wiley-Blackwell, 1998-09-01)
A portable or field test method for simultaneous spectrophotometric determination of calcium and magnesium in water using multivariate partial least squares (PLS) calibration methods is proposed. The method is based on the ...
Multivariate quality control studies applied to Ca(II) and Mg(II) determination by a portable method
(Wiley-Blackwell, 1998-09-01)
A portable or field test method for simultaneous spectrophotometric determination of calcium and magnesium in water using multivariate partial least squares (PLS) calibration methods is proposed. The method is based on the ...
Multivariate quality control studies applied to Ca(II) and Mg(II) determination by a portable method
(1998-01-01)
A portable or field test method for simultaneous spectrophotometric determination of calcium and magnesium in water using multivariate partial least squares (PLS) calibration methods is proposed. The method is based on the ...
The Walking Environment in Lima, Peru and Pedestrian–Motor Vehicle Collisions: An Exploratory Analysis
(Taylor and Francis, 2014)
Objective: Pedestrians comprise 78% of the road fatalities in Peru. The objective of this study was to explore the relationship between the walking environment and pedestrian–motor vehicle collisions. Methods: A matched ...
Gráficos de controle de Shewhart: Duas década de pesquisa
(Universidade Estadual Paulista (Unesp), 2007-12-13)
Esta tese apresenta, de forma compacta, os trabalhos mais importantes do autor, que são frutos de uma pesquisa de vinte anos sobre gráficos de Shewhart. O autor estudou os modelos que descrevem o tipo e o instante de ...