西格玛水平(σ), 合格率(%)和DPMO(百万机会缺陷数ppm)的对照表

品质协会

西格玛水平(σ)	合格率(%)	DPMO(PPM)
0	6.68	933200
0.125	8.455	915450
0.25	10.56	894400
0.375	13.03	869700
0.5	15.87	841300
0.625	19.08	809200
0.75	22.66	773400
0.875	26.595	734050
1	30.85	691500
1.125	34.435	645650
1.25	40.13	598700
1.375	45.025	549750
1.5	50	500000
1.625	54.975	450250
1.75	59.87	401300
1.875	64.565	354350
2	69.15	308500
2.125	73.405	265950
2.25	77.34	226600
2.375	80.92	190800
2.5	84.13	158700
2.625	86.97	130300
2.75	89.44	105600
2.875	91.545	84550
3	93.32	66800
3.125	94.79	52100
3.25	95.99	40100
3.375	96.96	30400
3.5	97.73	22700
3.625	98.32	16800
3.75	98.78	12200
3.875	99.12	8800
4	99.38	6200
4.125	99.565	4350
4.25	99.7	3000
4.375	99.795	2050
4.5	99.87	1300
4.625	99.91	900
4.75	99.94	600
4.875	99.96	400
5	99.977	230
5.125	99.982	180
5.25	99.987	130
5.375	99.992	80
5.5	99.997	30
5.625	99.99767	23.35
5.75	99.99833	16.7
5.875	99.999	10
6	99.99966	3.4

CPK与不良率(PPM)对照表, DPMO(PPM)和西格玛换算公式表格
http://www.pinzhi.org/forum.php?mod=viewthread&tid=400

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