Journal ArticleDOI
A Combined Adaptive Sample Size and Sampling Interval X Control Scheme
TLDR
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.Abstract:
A conventional X control chart works in an open loop manner. That is, the process control engineer waits until the control scheme signals an out-of-control condition. This paper proposes a combine...read more
Citations
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Journal ArticleDOI
Effects of Parameter Estimation on Control Chart Properties; A Literature Review
TL;DR: In this article, the control chart limits are calculated using parameter estimates from an in-control Phase I reference sample, and statistics based on new samples are compared with the estimated control limits to monitor for departures from the in..
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
Analytical methods for determining metabolites of polycyclic aromatic hydrocarbon (PAH) pollutants in fish bile. A Review.
TL;DR: The state-of-the-art for these different analytical methods is presented and the advantages and limitations of each approach as well as aspects related to analytical quality control and inter-laboratory comparability of data and availability of certified reference materials are discussed.
Journal ArticleDOI
A Survey of Recent Developments in the Design of Adaptive Control Charts
TL;DR: In this paper, a survey of recent developments in the statistical and economic design of adaptive or dynamic charts that allow some of their parameters to change is presented, in a comprehensive way.
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.
References
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Journal ArticleDOI
An approach to the probability distribution of cusum run length
D. Brook,David Evans +1 more
TL;DR: In this paper, the operation of a cumulative sum control scheme is regarded as forming a Markov chain and the transition probability matrix for this chain is obtained and then the properties of this matrix used to determine not only the average run lengths for the scheme, but also moments and percentage points of the run-length distribution and exact probabilities of run length.
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
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
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.