A New Generalized Range Control Chart for the Weibull Distribution

Table 2

The values of ARLs when , , , and .

	,
	1		1.5		2
	4.25		4.24		4.226
	ARL	SD	ARL	SD	ARL	SD
1	371.78	366.58	370.39	366.12	370.95	365.76
0.99	347.09	340.70	337.02	331.35	338.41	332.47
0.98	312.59	310.27	303.72	301.29	305.73	303.73
0.95	228.88	227.29	223.44	222.09	224.57	222.97
0.92	169.19	170.02	165.97	166.05	167.07	168.33
0.90	136.61	136.92	132.96	132.62	133.32	132.19
0.85	83.46	82.18	82.53	82.55	82.91	83.09
0.80	52.48	52.28	51.06	49.90	51.11	50.30
0.75	31.03	29.71	32.18	31.50	26.90	26.56
0.7	17.31	16.40	21.65	19.03	21.16	21.81
0.65	12.57	11.75	12.38	11.30	12.85	12.89
0.60	8.44	7.31	8.30	7.32	7.68	6.71