ABSTRACT
As was explained in the last chapter, the goal of response surface methodology is to describe in detail the relationship between a response variable (Y ) and the independent variables (X1, X2, . . ., Xk). A general quadratic equation is used as the mathematical French curve to accomplish this goal once data have been collected using one of the RSM designs already discussed in Chapter 9. The primary objectives of this chapter are to find the best equation to describe the system under study, check its adequacy, and use it to see what the surface looks like.
