Provides a three-dimensional view of the predicted process output (usually modeled through a DOE) versus two of the process inputs.
|When to Use||Purpose|
|Mid-project||The three-dimensional surface plot helps to visualize the effects of two process inputs (factors) on the process output. The height of the surface is the predicted process output at various settings of the two factors included in the plot.|
|Mid-project||Surface plots help you locate an optimal solution and assess the region around the optimal solution. If the region around the optimum is relatively flat, the optimum is robust to variation in the two factors. If the region is not relatively flat, any deviation of the one or more of the two factors could have serious consequences on the process output.|
|Mid-project||Used as a graphical aid in regression, ANOVA, or DOE.|
Continuous Y, two continuous X's.