Costa, A. F. B.; Rahim, M. A. - In: Journal of Applied Statistics 31 (2004) 10, pp. 1171-1183
Traditionally, an X-chart is used to control the process mean and an R-chart to control the process variance. However, these charts are not sensitive to small changes in process parameters. A good alternative to these charts is the exponentially weighted moving average (EWMA) control chart for...