A Combined Upper-Sided Synthetic S² Chart for Monitoring the Process Variance

Table 3

Comparisons of the combined upper-sided synthetic S² chart and several run rules S² charts when .

2-of-3	3-of-4	4-of-5
5	1.2	28.88	37.08	37.11	38.33
	1.4	8.59	11.56	12.46	13.65
	1.6	4.41	6.13	7.10	8.18
	1.8	2.94	4.23	5.20	6.22
	2.0	2.24	3.36	4.33	5.33
	2.2	1.86	2.90	3.87	4.85
	2.4	1.62	2.63	3.60	4.58
	2.6	1.47	2.46	3.43	4.41
	2.8	1.36	2.34	3.32	4.30
	3.0	1.28	2.26	3.24	4.23
10	1.2	15.50	19.47	18.95	19.40
	1.4	4.29	5.71	6.37	7.20
	1.6	2.33	3.32	4.16	5.06
	1.8	1.67	2.58	3.49	4.43
	2.0	1.37	2.29	3.23	4.19
	2.2	1.22	2.15	3.12	4.10
	2.4	1.13	2.08	3.06	4.05
	2.6	1.08	2.05	3.03	4.03
	2.8	1.05	2.03	3.02	4.02
	3.0	1.03	2.02	3.01	4.01