Results 11 to 20 of about 937,732 (286)
A study on the performances of the run sum X̄ chart under the gamma process [PDF]
ITM Web of ConferencesThe run sum (RS) X̄ chart is known as a simple and powerful tool for monitoring the mean of a process. Most developments of the RS X̄ chart assume that the underlying process comes from a normal distribution.
Le Goh Kai +4 more
doaj +2 more sources
A STUDY OF THE MEDIAN RUN LENGTH (MRL) PERFORMANCE OF THE EWMA t CHART FOR THE MEAN
South African Journal of Industrial Engineering, 2012 The exponentially weighted moving average (EWMA) chart is effective in detecting small shifts. However, the EWMA chart is not robust enough to prevent errors in estimating the process standard deviation or a changing standard deviation.
Chin, W. S., Khoo, M. B. C.
doaj +2 more sources
Journal of Probability and Statistics, 2018 A synthetic double sampling (SDS) chart is commonly evaluated based on the assumption that process parameters (namely, mean and standard deviation) are known.
Huay Woon You
doaj +2 more sources
Symmetry, 2023 Statistical process control (SPC) is used for monitoring and detecting anomalies in processes in the areas of manufacturing, environmental studies, economics, and healthcare, among others.
R. Sunthornwat +2 more
semanticscholar +1 more source
Journal of Science & Technology, 2023 The monitoring of a well-functioning process system has always held significant importance. In recent times, there has been notable attention towards employing control charts to oversee both univariate and multivariate coefficients of variation (MCV ...
Hamed Karimi +4 more
semanticscholar +1 more source
Design of attribute EWMA type control charts with reliable run length performance
Communications in statistics. Simulation and computation, 2021 Attribute control charts assuming a Poisson (c chart) or a binomial distribution (np chart) are usually used when the quality characteristic cannot be measured on a continuous scale. For equivalent sample sizes, Shewhart type attribute control charts are
Shu Wu +3 more
semanticscholar +1 more source
Mathematics, 2020 Shewhart control charts with estimated control limits are widely used in practice. However, the estimated control limits are often affected by phase-I estimation errors.
Ishaq Adeyanju Raji +4 more
doaj +1 more source
Unit Interval Time and Magnitude Monitoring Using Beta and Unit Gamma Distributions
Journal of Mathematics, 2022 Quick detection of an assignable cause is necessary for process accuracy with respect to the specifications. The aim of this study is to monitor the time and magnitude processes based on unit-interval data.
Muhammad Farhan Akram +3 more
doaj +1 more source
IEEE Access, 2022 In statistical process monitoring, it is often assumed that the sequential observations generated by processes are independent and identically distributed (iid).
Yi Li, Tahir Munir, Xuelong Hu
doaj +1 more source
Enhanced cumulative sum charts for monitoring process dispersion. [PDF]
PLoS ONE, 2015 The cumulative sum (CUSUM) control chart is widely used in industry for the detection of small and moderate shifts in process location and dispersion. For efficient monitoring of process variability, we present several CUSUM control charts for monitoring
Mu'azu Ramat Abujiya +2 more
doaj +1 more source