A Simple Approach for Monitoring Business Service Time Variation [PDF]
The Scientific World Journal, 2014 Control charts are effective tools for signal detection in both manufacturing processes and service processes. Much of the data in service industries comes from processes having nonnormal or unknown distributions.
Su-Fen Yang, Barry C. Arnold
doaj +4 more sources
Simulation Study for Parametric EWMA and NPWEWPA-SR Control Charts Against Non-Normality Assumptions [PDF]
Cauchy: Jurnal Matematika Murni dan Aplikasi, 2023 Common control chart types such as EWMA require assumptions to have valid information. The study compares IC robustness and OOC performance for parametric EWMA and NPEWMA-SR control charts in violation of symmetrical assumption.
Anwar Fitrianto +2 more
doaj +2 more sources
New EWMA charts for process variance [PDF]
Quality and Reliability Engineering International, 2023 AbstractThe EWMA chart is effective in detecting small shifts in the process mean or process variance. Numerous EWMA charts for the process variance have been suggested in the literature. In this article, new one‐sided and two‐sided EWMA charts are developed for monitoring the variance of a normal process.
Abdul Haq +2 more
openalex +2 more sources
Detection Sensitivity of a Modified EWMA Control Chart with a Time Series Model with Fractionality and Integration [PDF]
Emerging Science Journal, 2022 Among the many statistical process control charts, the modified exponentially weighted moving average (EWMA) control chart has been designed to swiftly detect a small shift in a process parameter.
Piyatida Phanthuna, Yupaporn Areepong
doaj +2 more sources
Performance of Bayesian EWMA control chart with measurement error under ranked set sampling schemes with application in industrial engineering [PDF]
Scientific Reports, 2023 The objective of this study is to investigate the behavior of the Bayesian exponentially weighted moving average (EWMA) control chart in the presence of measurement error (ME).
Yuzhen Wang +5 more
doaj +2 more sources
The Expected Average Run Length of the EWMA Median Chart with Estimated Process Parameters
Austrian Journal of Statistics, 2020 The performance of a control chart is commonly investigated based on the assumption of known process parameters. Nevertheless, in most manufacturing and service applications, the process parameters are usually unknown to practitioners.
Huay Woon You +3 more
doaj +3 more sources
Development of a VSS-EWMA chart for coefficient of variation with application to production process [PDF]
Scientific ReportsThis study introduces a novel Variable Sample Size Exponentially Weighted Moving Average (VSS-EWMA) control chart for monitoring the coefficient of variation, termed as Dynamic Adaptive CV (DACV) chart. Tailored for dynamic production settings where both
Amna Safeer +2 more
doaj +2 more sources
EWMA Chart and Measurement Error [PDF]
Journal of Applied Statistics, 2004 Measurement error is a usually met distortion factor in real-world applications that influences the outcome of a process. In this paper, we examine the effect of measurement error on the ability of the EWMA control chart to detect out-of-control situations. The model used is the one involving linear covariates.
Petros E. Maravelakis +2 more
openalex +4 more sources
On the performance of modified EWMA charts using resampling schemes [PDF]
Operations Research and Decisions, 2018 OPERATIONS RESEARCH AND DECISIONS; ISSN 2081 ...
Nasrullah Khan +3 more
openalex +4 more sources
Application of EWMA chart for monitoring process mean in paper industry [PDF]
Management Science Letters, 2019 This paper presents a statistical process control (SPC) chart for variables in a new feature for the paper machine in the paper industry. The traditional control charts like X-bar and R charts may be inadequate sometimes when the process exhibits ...
S. Ramesh, B.A. Vasu
doaj +2 more sources