Development and Evaluation of Control Charts Using Exponenrially Weighted Moving Averages

Abstract

The study is concerned with the development and evaluation of control charts using the Exponentially Weighted Moving Average (EWMA) of appropriate sample statistics based upon data from a process. The primary objectives are to present methodology for constructing the control limits of control charts using the EWMA of sample statistics and to use computer simulation to determine the mean action time of these control charts. Then, the equivalent Type I error of the EWMA control charts is examined. A computer simulation program is used in the study to determine the mean action time for a particular scenario. Modification of the program is then done to facilitate the determination of mean action time for other scenarios. comparisons of these mean action times with those of other popularly used control charts are also made.