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- Title
A new double exponentially weighted moving average control chart for monitoring both location and dispersion.
- Authors
Chatterjee, Kashinath; Koukouvinos, Christos; Lappa, Angeliki
- Abstract
In this article, we extend the single exponentially weighted moving average (EWMA) semicircle (EWMA‐SC) chart to a single double EWMA semicircle chart, called the DEWMA‐SC control chart. The run length (RL) characteristics of the proposed chart are computed through Monte‐Carlo simulations. A detailed comparative study is conducted to compare the performance of the proposed chart with that of the EWMA‐SC and GWMA‐SC charts with time‐varying control limits. The comparison results reveal that the DEWMA‐SC chart outperforms the competing charts in detecting most of the considered shifts in the process mean and/or variability. Additionally, the DEWMA‐SC chart shows very satisfactory overall performance for detecting a wide range of shift combinations of the process mean and dispersion, compared with the EWMA‐SC and GWMA‐SC charts assuming various control chart parameter values. Finally, real and simulated datasets are considered to present the implementation of the new chart.
- Subjects
QUALITY control charts; MOVING average process; DISPERSION (Chemistry)
- Publication
Quality & Reliability Engineering International, 2022, Vol 38, Issue 4, p1687
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.3046