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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Proceedings ArticleDOI
A preliminary study on the double sampling X-bar chart with unknown parameters
Wei Lin Teoh,Michael B. C. Khoo +1 more
TL;DR: In this article, the effects of parameter estimation on the performance of the double sampling X chart for both the in-control and out-of-control situations were discussed and the Phase-I sample-size recommendations were provided for practitioners in designing the DS X chart with estimated parameters, so that satisfactory performances as the case with known parameters are attained.
Journal ArticleDOI
Adaptive SPC monitoring scheme for DOE-based APC
Ye Liang,Pan Er-shun,Xi Lifeng +2 more
TL;DR: In this article, an adaptive SPC scheme is developed, which can better track the process transitions and achieve the possible SPC run cost reduction when the process is stable, by fully utilizing the estimation properties of the process model instead of traditionally using the data collected from the production line.
Journal ArticleDOI
Charts for Detecting Small Shifts
R. Sivasamy,S. Jayanthi +1 more
TL;DR: In this article, a Markov dependent sample size (MDSS) chart is discussed that can detect even small shifts faster than other matched charts and conditions are outlined which make the MDSS chart signal similar as the SS or VS Schart during the in-control period.
Book ChapterDOI
The Variable-Dimension Approach in Multivariate SPC
TL;DR: In this paper, the variable dimension approach was proposed for monitoring multivariate processes, where the idea is to measure always (at each sampling time) the "non-expensive" variables and to measure the expensive ones only when the values of the non-expensive variables give some level of evidence that the process may be out of control.
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.