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 Article
How to Choose Parameters of Control Chart with Adaptive Parameters
Roberto Campos Leoni,A. F. B. Costa,José Wilson de Jesus Silva,Nilo Antonio de Souza Sampaio,R. B. Ribeiro +4 more
TL;DR: This paper describes how to plan and estimate the optimal parameters of an adaptive chart to monitor a process average using variable sample size and interval and two functions written in R language that assist the user in the design of a adaptive control chart are exhibited.
Journal ArticleDOI
Economic Design of Three-Stage X̅ Control Chart Based on both Performance and Surrogate Variables
Shin-Seok Kwak,Joo Ho Lee +1 more
TL;DR: The proposed design outperforms the optimal design of the two-stage chart in terms of the expected cost per unit time unless the correlation between the performance and surrogate variables is modest and the shift in process mean is smallish.
Journal ArticleDOI
EWMA chart with variable sample size and sampling interval for monitoring Pareto data with estimated parameters
Xiao-Bin Cheng,Fu-Kwun Wang +1 more
Journal Article
Economic-Statistical Design of VSI Run Rules Charts
Bun-Kyu Kang,Tae-Jin Lim +1 more
TL;DR: In this article, a method for designing VSI (Variable Sampling Interval) control charts with supple-mentary run rules is proposed, where the sampling process of the VSI run rules chart is constructed by Markov chain approach.
Journal ArticleDOI
Optimal Variable Sample Size and Sampling Interval Control Chart for the Process Mean based on Expected Average Time to Signal
TL;DR: The findings show that the VSSI X chart prevails over the Shewhart X chart under comparison and being able to vary the sample size and sampling interval, a practitioner will have more flexibility and better control of the process and at the same time is able to detect an out-of-control signal quicker.
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.