INTEGRATING STATISTICAL PROCESS CONTROL AND ENGINEERING PROCESS CONTROL TABLE 2.Average Run Lengths for the Rules in Table 1.Standard Deviations of the Run Length are Given in Parenthesis EPC and EPC and Shewhar A=0.4 h=5,k=0.5 品 5 7.5 10 (6.) 3 (02) d of 0. 5,010.025050 and period rr rall,the EWMA CUSUM per perc nc :11 an EPO similarly hen 4ned.e,ad iusted)for s indication that the three non-She shift conditions (see Lucas and Saccucci (1990)). provide more reduction in variability than does the ances it may be better to Shewhart chart for individuals.The EWMA with itortheontolariabiethan"heutpatreHae 入=0.1 and the CUSUM are particularly effective investigated the efTect of applying the SPC proce- Tal ate dure to the control actions c var d th the manipulate ave Al mery,and eat s when the of nd is 0.10 un its pe C/SPC tha ith EPC alone. were achieved TABLE: EPC/SPC R of the Performance Measure are Given in Parenthesis Trend EPC 0.1 h=5,k= 05 0.5 7 9778 (0.0050 0.0 71 0. (0.0077 0.0061) 0.10 2534 98 519 593 (0.0051) 0. (0.0072) (0.0144 (0.0068 0.25 2543 963 2g1 467 291 0.0051) t0.0166) (0.0304） (0.0080) (0.0155 (0.0077 0.50 165 2.976 3413 2.910 (0.0051) 1003251 (0.0309) (0.0079) (0.0154 (0.0076) 1.00 170573 3814 2.080 2.885 (0.0051) (0.0620) (0.0261) (0.0076) (0.0113) (0.0071) Vol.26,No.2.April 1994 Journal of Qualily Technology