Research Article
Multichart Schemes for Detecting Changes in Disease Incidence
Table 4
ARLs with their SDRL (in bracket) for the EWMA charts and EWMA multichart with
.
| | Shifts in | | | | Average EWMA | | | | |
| | 1.00 | 500.94 (484.69) | 501.15 (500.08) | 501.23 (496.67) | 501.11 (493.81) | 501.97 (492.12) | | 1.25 | 82.02 (61.84) | 138.95 (136.88) | 163.51 (162.92) | 128.16 (120.55) | 95.57 (82.52) | | 1.50 | 35.52 (20.29) | 54.14 (53.46) | 72.77 (71.59) | 54.14 (48.45) | 37.43 (25.96) | | 1.75 | 22.22 (10.15) | 27.86 (25.25) | 37.67 (36.63) | 29.25 (24.01) | 21.23 (13.16) | | 2.00 | 16.54 (6.44) | 16.56 (14.17) | 22.99 (21.50) | 18.70 (14.04) | 14.37 (8.78) | | 2.25 | 13.04 (4.67) | 11.19 (8.98) | 14.90 (13.57) | 13.04 (9.07) | 10.47 (6.36) | | 2.50 | 10.82 (3.54) | 8.14 (6.07) | 10.61 (9.44) | 9.86 (6.35) | 8.17 (5.14) | | 2.75 | 9.44 (2.96) | 6.31 (4.46) | 7.99 (6.95) | 7.91 (4.79) | 6.52 (4.19) | | 3.00 | 8.27 (2.48) | 5.19 (3.40) | 6.11 (5.02) | 6.52 (3.63) | 5.37 (3.44) | | 3.25 | 7.47 (2.19) | 4.36 (2.75) | 5.13 (4.02) | 5.65 (2.99) | 4.54 (2.90) | | 3.50 | 6.76 (1.91) | 3.78 (2.23) | 4.20 (3.15) | 4.91 (2.43) | 3.92 (2.48) | | ETD | 16.121 | 18.637 | 23.458 | 19.404 | 14.653 | | ETDE | 21.210 | 27.648 | 34.588 | 27.814 | 20.759 |
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