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The 'effective variance' control chart for monitoring the dispersion process with missing data
Garcia-Diaz, J. Carlos - In: European Journal of Industrial Engineering 1 (2007) 1, pp. 40-55
In the last few years, multivariate quality control has been thoroughly studied. The control of the population means vector is usually obtained by using multivariate control charts developed for this purpose. Nevertheless, when the goal is the efficient control of the covariance matrix, few...
Persistent link: https://www.econbiz.de/10008563616
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The 'effective variance' control chart for monitoring the dispersion process with missing data
Garcia-Diaz, J. Carlos - In: European Journal of Industrial Engineering 1 (2007) 1, pp. 40-55
In the last few years, multivariate quality control has been thoroughly studied. The control of the population means vector is usually obtained by using multivariate control charts developed for this purpose. Nevertheless, when the goal is the efficient control of the covariance matrix, few...
Persistent link: https://www.econbiz.de/10005754445
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Model based control charts in stage 1 quality control
Koning, Koning, A.J. - Faculteit der Economische Wetenschappen, Erasmus … - 1999
In this paper a general method of constructing control charts for preliminary analysis of individual observations is presented, which is based on recursive score residuals. A simulation study shows that certain implementations of these charts are highly effective in detecting assignable causes.
Persistent link: https://www.econbiz.de/10010731785
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An NP Control Chart Using Double Inspections
Wu, Zhang; Wang, Qinan - In: Journal of Applied Statistics 34 (2007) 7, pp. 843-855
The np control chart is used widely in Statistical Process Control (SPC) for attributes. It is difficult to design an …
Persistent link: https://www.econbiz.de/10005492097
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Robust design of adaptive control charts for manual manufacturing/inspection workstations
Celano, Giovanni - In: Journal of Applied Statistics 36 (2009) 2, pp. 181-203
workstations the statistical process control (SPC) procedure of collecting sample statistics related to a critical … study is to design a local SPC inspection procedure implementing an adaptive Shewhart control chart locally managed by the … optimization and the selection of the optimal SPC adaptive procedure. …
Persistent link: https://www.econbiz.de/10005639780
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Minimal Euclidean distance chart based on support vector regression for monitoring mean shifts of auto-correlated processes
Du, Shichang; Lv, Jun - In: International Journal of Production Economics 141 (2013) 1, pp. 377-387
Though traditional control charts have been widely used as effective tools in statistical process control (SPC), they … shifts in auto-correlated processes, and it can be used as a promising tool for SPC. …
Persistent link: https://www.econbiz.de/10010594389
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Model based control charts in stage 1 quality control
Koning, A.J. - Erasmus University Rotterdam, Econometric Institute - 1999
In this paper a general method of constructing control charts for preliminary analysis of individual observations is presented, which is based on recursive score residuals. A simulation study shows that certain implementations of these charts are highly effective in detecting assignable causes.
Persistent link: https://www.econbiz.de/10008584758
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A combined control scheme for monitoring the frequency and size of an attribute event
Liu, Yafen; He, Zhen; Shamsuzzaman, M.; Wu, Zhang - In: Journal of Applied Statistics 37 (2010) 12, pp. 1991-2013
A traffic accident can be considered as an example of the attribute events, and the number of the injured in each accident is called the event size. Some control charts have been developed for monitoring either the time interval (T) between the occurrences of an event or the event size (C) in...
Persistent link: https://www.econbiz.de/10008773846
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The RL2 chart versus the np chart for detecting upward shifts in fraction defective
Bourke, Patrick - In: Journal of Applied Statistics 33 (2006) 1, pp. 1-15
conforming run-lengths, is investigated in order to provide SPC practitioners with clear-cut guidance on the comparative …
Persistent link: https://www.econbiz.de/10005278951
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Robust Control Charts for Time Series Data
Croux, C.; Gelper, S.; Mahieu, K. - Tilburg University, Center for Economic Research - 2010
This article presents a control chart for time series data, based on the one-step- ahead forecast errors of the Holt-Winters forecasting method. We use robust techniques to prevent that outliers affect the estimation of the control limits of the chart. Moreover, robustness is important to...
Persistent link: https://www.econbiz.de/10011090480