AN X AND EWMA CHART FOR INDIVIDUAL OBSERVATIONS Standard Deviation Shifts fromto Quality Co i28.pp.187-191 Chart 1.21.522.53 Bu-lensth Dis 33 d Mo X and MR Control Charts 1,pP155-162 X and EWMA 18. EWMA 143461796 p.2083-210. method is convenient in that nd Ha dM店 that the fals s mean can be detected.Further pT.D.W.and.D.L (1902)- "Twin Met A char EWNA chart aone because it detects shifts in the ,W.pp.36-37 process standard deviation. he CUSUM chart in not familia t one c ton proce fective as the X and EWMA chart.Clearly,if the S.().Co Charts for Individual Me 99 14:Pp.I we would 2m Acknowledgments T.Y.( 20.pp.8 References SAS.ING mmetrics34.DD.251-25 Veraon 60.SAS Institute,Inc.,Cary.NC Vol.29.No.1.January 1997 Joural of Quality Technology Reproduced with permission of the copyright owner.Further reproduction prohibited without permission.Reproduced with permission of the copyright owner. Further reproduction prohibited without permission