Journal ArticleDOI
X̄ charts with variable sample size
TLDR
In this article, the authors considered the properties of the X chart when the size of each sample depends on what is observed in the preceding hours and the usual practice in using a control chart to monitor a process is to take samples of size n from the process every h hours.Abstract:
The usual practice in using a control chart to monitor a process is to take samples of size n from the process every h hours. This article considers the properties of the X chart when the size of each sample depends on what is observed in the preceding ..read more
Citations
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Journal ArticleDOI
Economic Design of A Modified Variable Sample Size and Sampling Interval Chart
TL;DR: In this article, a comprehensive economic cost function is derived for a modified variable sample size and sampling interval X (MVSSI) chart, which can be used to obtain optimal design parameters of these charts that minimize the process control related cost per hour.
Journal ArticleDOI
A new double sampling X¯ control chart for monitoring an abrupt change in the process location
TL;DR: A new double sampling monitoring scheme, namely, the side-sensitive DS chart, to monitor the process mean is developed, and it was observed that the proposed chart presents a better overall performance than the existing DS chart.
Journal ArticleDOI
Gráfico de controle de VMAX para o monitoramento da matriz de covariâncias
TL;DR: The grafico proposto (VMAX) as discussed by the authors is an artigo for monitoramento de processos normais bivariados, which is based on a variância amostral generalizada |S|.
Journal ArticleDOI
Monitoring Two Dependent Process Steps Using Special Variable Sample Sizes and Sampling Intervals Cause‐Selecting Control Charts
TL;DR: An adaptive statistical process control scheme to monitor a process with two dependent steps is proposed and it is shown that performance of the proposed scheme with four variable parameters is similar and even somewhat better than that of the scheme with six variable parameters.
References
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Journal ArticleDOI
X charts with variable sampling intervals
TL;DR: The variable sampling interval (VSI) chart as discussed by the authors uses a short sampling interval if the sample is close to but not actually outside the control limits, and a long sampling interval for the sample if it is closer to target.
Journal ArticleDOI
Combined Shewhart-CUSUM Quality Control Schemes
TL;DR: The SheWhart-CUSUM quality control scheme which combines the key features of the Shewhart and CUSUM control procedures is described and evaluated.
Journal ArticleDOI
A Combined Adaptive Sample Size and Sampling Interval X Control Scheme
TL;DR: In this paper, a combine X control chart is proposed, where the process control engineer waits until the control scheme signals an out-of-control condition, and then the process can be restarted.
Journal Article
Double sampling X charts
TL;DR: In this article, the double sampling X chart is proposed, which is the counterpart to double sampling plans, which offers better statistical efficiency (in terms of statistical efficiency) than double sampling plan.
Journal ArticleDOI
Double Sampling X̅ Charts
TL;DR: The purpose of this paper is to propose a new control chart, the double sampling X chart, which is the counterpart to double sampling plans, which offers better statistical efficiency.