Page 137 - Six Sigma Advanced Tools for Black Belts and Master Black Belts

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August 31, 2006
2:57
JWBK119-09
122 Computing Process Capability Indices for Nonnormal Data
Weibull (1.0, 2.0)
1.6
1.5
1.4
1.3
1.2
C pu 1.1
1.0 C pu = 1.0
0.9
0.8
0.7
0.6
Assumed Distribution Clements’ Johnson
normal free tolerance method transform
Probability Weighted Box-Cox Wright’s
plot variance transform index
Figure 9.9 Box plots of ˆ C pu for all methods (100 observations each) for Weibull (μ = 0, η = 1.0)
with target C pu = 1.0.

Weibull (1.0, 2.0)
2.4

2.2
2.0

1.8
C pu 1.6
C pu = 1.5
1.4
1.2

1.0

0.8
Assumed Distribution Clements’ Johnson
normal free tolerance method transform
Probability Weighted Box-Cox Wright’s
plot variance transform index

Figure 9.10 Box plots of ˆ C pu for all methods (100 observations each) for Weibull (σ = 1.0,
η = 2.0) with target C pu = 1.5.