EconolDic-statistical design of an S EWMA control chart for monitoring process variability

摘要

The aim of this study is to present the economic-statistical design of an EWMA control chart for monitoring the process dispersion. The optimal economic-statistical design of the 5 EWMA chart was determined for a wide benchmark of examples organized as a two level factorial design and was compared with the designs obtained for the 5 Shewhart chart. Both the two charts have been designed so that an equal number of false alarms (in-control Average Run Length) is expected.