Mixture Design Tutorials - Statease.info

Graphical Optimization
Select the Graphs button to see the number 1 solution flagged on a contour plot of
desirability.
Optimal solution with added POE criteria
By shading out regions that fall outside of specified contours, you can identify a
desirable “window” for each response. If plotted on clear view foils (overheads), all
response plots can be overlaid to identify the “sweet spot” for the mixture formulation –
an area where all specifications can be met. In this case, the response specifications are:
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39 < Viscosity < 48
POE (Viscosity) < 8
Turbidity < 900
POE (Turbidity) < 120
To overlay the plots for all these responses, click on the Graphical optimization node at
the lower left of your screen. For the Viscosity response enter a Lower limit of 39
and an Upper limit of 48.
7-36 • Mixture Design Tutorials Design-Expert 6 User’s Guide