Use a contour plot to see how a response variable relates to two predictor variables. A contour plot provides a two-dimensional view in which all points that have the same response are connected to produce contour lines of constant responses. Contour plots are useful for investigating desirable response values and operating conditions.
Minitab uses interpolation to create the area between data points. For more information, go to Working with mesh on contour plots and 3D graphs.
To see the exact values of the predictor variables represented by a point on the plot, right-click the plot and select Crosshairs. Then use your pointer to move the crosshair over the plot. Minitab displays the values of the predictor variables for each point in the upper left corner of the plot. For more information, go to Using crosshairs and flags to display x-, y-, and z-values.