I E 6610 Lecture 2: Six-Sigma 2

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1. The following data were collected over time as follows
Characteristic
D(Defects)
U(units)
O (opportunity per unit)
A
56
300
88
B
44
350
75
C
30
55
32
D
83
50
60
E
95
630
70
F
53
800
40
Compute DPU,DPO and DPMO for each characteristic. Rank DPMO for each characteristic
from highest to smallest.
Solution DPU = no. of defects/no. of units
DPO = Total no. of defects/Total no. of opportunity = DPU/O
DPMO = DPO * 10^6
Characteristic A:
DPU = 56 / 300 = 0.1866
DPO = 56 / 300*88 = 0.00212
DPMO = 0.00212*10^6 = 2120
Characteristic B:
DPU = 44 / 350 = 0.1257
DPO = 44 / 350*75 = 0.00167
DPMO = 0.00167*10^6 = 1670
Characteristic C:
DPU = 30 / 55 = 0.5454
DPO = 30 / 55*32 = 0.01704
DPMO = 0.01704*10^6 = 17040
Characteristic D:
DPU = 83 / 50 = 1.66
DPO = 83 / 50*60 = 0.02766
DPMO = 0.02766*10^6 = 27660
Characteristic E:
DPU = 95 / 630 = 0.1507
DPO = 95 / 630*70 = 0.00215
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