SKEDSOFT

Attribute Data:  Demerit Charting and u- Charting (cont.): Algorithm:

Removing the 3 demerits and 22 patients from Day 5 from consideration, C = 1027 and N = 908. Then, the final process capability = CL = 1027 ÷ 908 = 1.131. The revised control limits are LCL = 1.131 – 3.0 × sqrt [1.131 ÷ ni] and

UCL = 1.131 3.0 × sqrt [1.131 ÷ ni] where ni potentially varies from period to period.