Journal ArticleDOI
X̄ Charts with Variable Parameters
TLDR
This paper extends the study of the X chart with variable parameters to include variable action limits, and presents a meta-analyses of the response of the immune system to these limits.Abstract:
Varying the parameters of the X chart has been explored extensively in recent years. In this paper, we extend the study of the X chart with variable parameters to include variable action limits. ...read more
Citations
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Journal ArticleDOI
An alternative approach to fuzzy control charts: Direct fuzzy approach
Murat Gülbay,Cengiz Kahraman +1 more
TL;DR: Some contributions to fuzzy control charts based on fuzzy transformation methods are made by the use of @a-cut to provide the ability of determining the tightness of the inspection: the higher the value of @ a the tighter inspection.
Journal ArticleDOI
Joint X̄ and R Charts with Variable Sample Sizes and Sampling Intervals
TL;DR: In this paper, the authors investigated processes that are monitored by both X-bar and R charts and showed that the Xbar chart with variable sampling intervals (VSI) or with variable sample sampling interval (VAI) outperforms the R chart.
Journal ArticleDOI
Joint X̄ and R charts with variable parameters
TL;DR: In this article, the Vp feature was used to improve the performance of the joint X and R control chart in terms of the speed with which the process mean and variance shifts are detected.
Journal ArticleDOI
Economic design of X charts with variable parameters: The Markov chain approach
TL;DR: In this article, the authors present an economic design of X control charts with variable sample sizes, variable sampling intervals, and variable control limits, where the sample size n, the sampling interval h, and the control limit coefficient k vary between minimum and maximum values, tightening or relaxing the control.
Journal ArticleDOI
Adaptive Control Charts for Attributes
TL;DR: A general model for adaptive c, np, u and p control charts in which one, two or three design parameters (sample size, sampling interval and control limit width) switch between two values, according to the most recent process information is developed.
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
X̄ charts with variable sample size
TL;DR: 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.
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 ArticleDOI
X¯ chart with adaptive sample sizes
TL;DR: In this paper, the adaptive-sample-size control chart is compared with the fixed-sample size control chart in terms of average run length under shifts in the process mean of variable magnitude.
Journal ArticleDOI
X̄ Chart with Variable Sample Size and Sampling Intervals
TL;DR: In this article, the X-bar chart with variable sampling intervals (VSI) and the variable sample size (VSS) are compared to the traditional X-Bar chart in detecting shifts in the process.