Mixture Design Tutorial (Part 2 – Optimization) - Statease.info

Setting Target for first response of viscosityThese limits indicate that it is most desirable to achieve the targeted value of 43, butvalues in the range of 39-48 are acceptable. Values outside that range have no (zero)desirability.Now click on the second response, Turbidity. Select the Goal of minimize, withLimits set at Lower of 800 and Upper of 900. You must provide both thesethresholds to get the desirability equation to work properly. By default they will be setat the observed response range, in this case 321 to 1122. However, evidently in this casethere’s no advantage to getting the detergent’s turbidity below 800 – it already appearsas clear as can be to the consumer’s eye. On the other hand, when turbidity exceeds 900,it looks as bad as it gets.Aiming for minimum on second response of turbidity4 • Mixture Design Tutorial – Part 2 Design-Expert 7 User’s Guide