Page 135 - Six Sigma Advanced Tools for Black Belts and Master Black Belts

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JWBK119-09
120 Computing Process Capability Indices for Nonnormal Data
lognormal (0.0, 0.5)
18
16
14
12
10
C pu 8

6
4

2
C pu = 1.667

Assumed Distribution Clements’ Johnson
normal free tolerance method transform
Probability Weighted Box-Cox Wright’s
plot variance transform index

Figure 9.5 Box plots of ˆ C pu for all methods (100 observations each) for lognormal (μ = 0,
2
σ = 0.5) with target C pu = 1.667.

lognormal (0.0, 0.3)
3.0

2.5

2.0

C pu 1.5

1.0 C pu = 1.0

0.5

Assumed Distribution Clements’ Johnson
normal free tolerance method transform
Probability Weighted Box-Cox Wright’s
plot variance transform index
Figure 9.6 Box plots of ˆ C pu for all methods (100 observations each) for lognormal (μ = 0,
2
σ = 0.3) with target C pu = 1.0.