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Monitoring bivariate and trivariate mean vectors with a Shewhart chart
(Wiley-Blackwell, 2017-12-01)
In this article, we propose the use of the mean chart to control multivariate processes. The basic idea is to control the mean vector of bivariate (X, Y) and trivariate (X, Y, Z) processes by alternating the charting ...
Monitoring bivariate and trivariate mean vectors with a Shewhart chart
(2017-12-01)
In this article, we propose the use of the mean chart to control multivariate processes. The basic idea is to control the mean vector of bivariate (X, Y) and trivariate (X, Y, Z) processes by alternating the charting ...
The double sampling range chart
(2017-12-01)
The R chart and the S2 chart are the usual charts for monitoring process dispersion; however, the double sampling (DS) scheme has only be used with the S2 chart. The difficulty in obtaining the properties of the DS R chart ...
Economic design of Shewhart control charts for monitoring autocorrelated data with skip sampling strategies
(Elsevier B.V., 2014-05-01)
On-line monitoring of process variability is strategic to achieve high standards of quality and maintain at acceptable levels the number of nonconforming items. Shewhart control charts are the simplest Statistical Process ...
A new sampling strategy for the Shewhart control chart monitoring a process with wandering mean
(Taylor &francis Ltd, 2015-07-18)
In many processes, such as in chemical and process industries, the observations of a quality characteristic to be monitored may be correlated, if sampling intervals are short. Correlation can be modelled by considering the ...
An adaptive chart for monitoring the process mean and variance
(Wiley-Blackwell, 2007-11-01)
Traditionally, an (X) over bar chart is used to control the process mean and an R chart is used to control the process variance. However, these charts are not sensitive to small changes in the process parameters. The ...
A new sampling strategy for the Shewhart control chart monitoring a process with wandering mean
(Taylor &francis Ltd, 2015)
An adaptive chart for monitoring the process mean and variance
(Wiley-Blackwell, 2014)
Gráficos de controle X para processos robustos
(Universidade Federal de São Carlos (UFSCar), 1998-12-01)
O avanço tecnológico tem tornado os processos produtivos cada vez mais robustos (robustos no sentido de produzirem itens cada vez mais iguais). Neste contexto, pequenas alterações no processo podem ser críticas, devendo ...