Taguchi loss functions, as continuous quality

C. Taguchi Loss Functions as Continuous Quality Cost Models.401... 

This Section addresses cases with a continuous performance metric, y. We identify the corresponding problem statements and results, which are compared with conventional formulations and solutions. Then Taguchi loss functions are introduced as quality cost models that allow one to express a quality-related y on a continuous basis. Next we present the learning methodology used to solve the alternative problem statements and uncover a set of final solutions. The section ends with an application case study. 

Instead of a single quality-related performance variable, z, as in Section V, let s suppose that one has to consider a total of P distinct objectives and the corresponding continuous performance variables, z, / = 1P, which are components of a performance vector z = [zj,..., zPY- In such case, one has to identify the corresponding Taguchi loss functions, L(z,), i = 1,..., P, for each of the performance variables ... 

---