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Taguchi’s Orthogonal Array Experiment  489



                   18


                   13
                Porosity


                    8


                    3

                       1                                2
                                        A



                     A         G        D         B        E
              17
              14
             Porosity  11

               8
               5

                   1      2  1      2  1     2  1     2  1      2
           Figure 13.3 Main-effects plots—data means for porosity.




              20




             Yield  15





              10

                  1                2               3
                                   A
           Figure 13.4 Main-effects plot—data means for yield.
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