| Scheme | Control Region | Control Chart Parameters ARL = 250 | Control Chart Parameters ARL = 370 |
| EEr | Rectangular | lE = 0.134, E0 =0 HE = 0.345, hE = −0.345 le = 0.106, e0 = −0.270 He = 0.215, he = −0.867 | lE = 0.120, E0 = 0 HE = 0.3385, hE = −0.3385 le = 0.100, e0 = −0.270 He = 0.2205, he = −0.8772 |
| EEe | Elliptical | lE = 0.134, E0 = 0 HE = 0.372, hE = −0.372 le = 0.106, e0 = −0.270 He = 0.250, he = −0.92 | lE = 0.120, E0 = 0 HE = 0.3722, hE = −0.3722 le = 0.100, e0 = −0.270 He = 0.2540, he = −0.8994 |