Statistical control charts are widely used in the manufacturing industry. The Shewhart-type control charts are developed to improve the monitoring process mean by using the double quartile-ranked set sampling, quartile double-ranked set sampling, and double extreme-ranked set sampling methods. In terms...
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The process parameter in these charts is generally estimated based on conventional methods such as the maximum likelihood and minimum variance unbiased estimators, whereas these are very sensitive to outliers and thus could result in severe bias for obtaining the control limits of the charts. To ...
Quality control chartsusing appropriate control limits (e.g., ± 20% of the target value) depending on the analytical method employed. unesdoc.unesco.org unesdoc.unesco.org y 针对所采用的分析方法选取适当的控制线(例如:目标数值的± 20%)绘制质量控制图表。
aAre monitoring and control procedures carried out based on suitable process and product features (e.g. quality control charts, intermediate inspections)? 是根据适当的过程和产品性能被执行的监控规程 (即。 质量管理图,中间检查)?[translate]
These procedures generate various control charts useful for monitoring the average and variability of a process. The X-bar, EWMA, Moving Average, Individuals, Range, Standard deviation, Moving Range, and CUSUM charts are available. Capability analysis and various reports are also available. ...
Control charts, Cusum techniques and funnel plots. A review of methods for monitoring performance in healthcare. Quality control in medicine is generating more and more interest. Industrial concepts of quality control have been refined and transformed to be useful in ... N Luc - 《Interactive Car...
Lastly, all Shewhart control charts have lines drawn to represent either the upper or lower control limits. In most cases both control lines are present, in others where the data have a natural bound, such as zero, only one of these control limits might be drawn. ...
Monitoring: The QA process also involves monitoring the activities to ensure that the quality standards are implemented. In contrast, quality control processes use a product-oriented approach. Since QC is backward-looking and reactive, it’s concerned with validating the outcome against the predefined...
Economic-statistical design of multivariate control charts for monitoring the mean vector and covariance matrix When a control chart is used to monitor a process, three test parameters should be determined: the sample size, the sampling interval between successive sa... LR Huang - 《Journal of Los...