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
A Single Statistic for Monitoring the Covariance Matrix of Bivariate Processes
TL;DR: In this article, a new control chart for monitoring the covariance matrix in a bivariate process is presented, which is based on the control chart presented in this paper. But it is not a control chart that monitors the correlation matrix.
Journal ArticleDOI
Variable sample size and variable sampling interval Shewhart control chart with estimated parameters
TL;DR: This paper will calculate the mean of the ATS for VSSI when the control limits are estimated in three different ways, and shows that parameter estimation has significant effect on the in-control ATS, but has little effect onThe out-of- control ATS.
Journal ArticleDOI
An improved variable sample size and sampling interval S control chart
TL;DR: It is found that the t VSSI S chart is superior to the optimal exponentially weighted moving average (EWMA) S, optimal modified variable sample size and sampling interval (VSSI) S and standard S charts.
Journal ArticleDOI
A new variable sample size control chart using MDS sampling
TL;DR: In this article, a variable sample size (VSS) control chart using multiple dependent state sampling is proposed, where the sample size for the next subgroup is chosen on the basis of the location of the control statistic from the current subgroup in two pairs of control limits.
Journal ArticleDOI
Monitoring linear profiles using an adaptive control chart
TL;DR: In this paper, a variable sample size chi-squared control chart (VSS χ χ 2 control chart) for monitoring linear profiles is proposed. But the proposed chart is not suitable for the measurement of the linear profiles in a calibration application of semiconductors.
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.