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Objective Function
Objective function are used to simultaneously optimize several output variables. They can reference any of the characteristics of the outputs and inputs. One example is Minimum[O1{Cpk},O2{Cpk}] where O1 and O2 are output variables. Maximizing this objective function ensures all the outputs have acceptable values of Cpk. Objective functions can also be written for Taguchi's signal to noise ratios allowing them to be maximized.