A New Generalized Range Control Chart for the Weibull Distribution

Table 4

The values of ARLs when , , , and .

	,
	1		1.5		2
	4.255		4.245		4.245
	ARL	SD	ARL	SD	ARL	SD
1	373.74	367.11	371.71	369.38	373.00	366.31
0.99	345.51	336.44	337.18	333.44	345.25	336.30
0.98	310.97	309.32	308.68	307.83	310.29	308.20
0.95	227.81	228.32	229.18	227.59	227.54	227.96
0.92	170.82	168.79	169.74	164.95	170.77	168.88
0.9	137.30	136.83	135.39	135.90	136.80	136.52
0.85	83.51	82.64	85.79	85.58	83.72	83.06
0.8	52.97	52.01	52.46	52.45	52.57	51.64
0.75	32.66	32.38	32.93	32.33	32.78	32.35
0.7	19.55	16.39	21.76	21.24	22.85	22.10
0.65	15.26	13.62	14.51	13.51	14.75	13.55
0.6	8.68	9.23	9.40	8.39	9.50	9.80