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Taguchi’s Orthogonal Array Experiment 487
3 T 2
2
SS B (T 2 T 2 T )
9
1 B 1 B 2 B 3 9
1
3
2
2
2
[(8 11 21) (12 12 18) (9 15 20) ]
9
1
(8 12 9 11 12 15 21 18 20) 2
9
2.667
Similarly
SS C 18.667
2
2
2
2
2
2
2
2
2
SS T [8 12 9 11 12 15 21 18 20 ]
1
(8 12 9 11 12 15 21 18 20) 2
9
180
Using MINITAB, we get the following ANOVA table:
Source DF Seq SS Adj SS Adj MS F P
A 2 158.000 158.000 79.000 **
B 2 2.667 2.667 1.333 **
C 2 18.667 18.667 9.333 **
Error 2 0.667 0.667 0.333
Total 8 180.000
Clearly, from Fig. 13.2, A is by far the most important variable and C is a
distant second.
A 87.78
Factors C 10.37
B 1.48
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Percentage contribution
Figure 13.2 Percentage contribution of each factor.
