DOE Part 3 : Center Point in Factorial Design Using Minitab

The center point represents the average or midpoint of the variable ranges being studied. In a factorial design, the center point is often used as a reference point to compare the effects of the variables at different levels. By including the center point in the design, researchers can assess the curvature of the response surface and detect potential non-linear relationships between the variables and the outcome.

The center point is particularly useful for identifying potential quadratic effects and for checking the adequacy of the model being used. It provides valuable information about the behavior of the system under study and helps to ensure that the experimental design is robust and comprehensive.