An EWMA control chart for monitoring the mean of skewed populations using weighted variance

• Published in: 2008 IEEE International Conference on Industrial Engineering and Engineering Management pp. 218 - 223
• Main Authors: Khoo, M., Atta, A.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.12.2008
• Subjects: Chemical processes; Condition monitoring; Control charts; Cutting tools; Distributed computing; Equations; Error correction; EWMA chart; Gaussian distribution; Random variables; skewed populations; skewness correction; Type-I error; Type-II error; weighted standard deviation; weighted variance; X̄ chart

This paper discusses the use of weighted variance (WV) in setting up the limits of the exponentially weighted moving average (EWMA) chart for the monitoring of the mean of a process from a skewed population. This chart, called the WV-EWMA chart hereafter, reduces to the standard EWMA chart when the...