Contour and Surface Plots (Mixture Design)
main topic  

Contour and surface plots are useful for establishing desirable response values and mixture blends.

·    A contour plot provides a two-dimensional view where all points that have the same response are connected to produce contour lines of constant responses.

·    A surface plot provides a three-dimensional view that may provide a clearer picture of the response surface.

The illustrations below show a contour plot and 3D surface plot of the same data.

·    The highest flavor values are found where:

-    A = 80%    B = 0%      C = 20%

-    A = 0%      B = 80%    C = 20%

·    The lowest flavor value is found where:

-    A = 0%      B = 0%      C = 100%

Contour Plot

3D Surface Plot

 

Note

When the model has more than three components, the components that are not in the plot are held constant. Any process and amount variables in the model are also held constant. You can specify the values at which to hold the remaining variables in the Settings subdialog box.