Mixture Design Tutorial (Part 1 â The Basics) - Statease.info

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Flag enlarged via Toggle Size optionThe expanded flag displays a 95 percent confidence interval (CI) on the mean prediction.It also provides the prediction interval (PI). Use this to ‘manage expectations’ aboutindividual confirmation runs near this point. The PI conveys how natural variability inthe process/sampling/testing plus imprecision in the estimate of the mean (SE mean)causes actual outcomes to differ from the prediction. The larger flag also lists the pointcoordinates. If you have a printer, you can print the contour plot by using the File, Printmenu item.Generating a 3D View of the Response SurfaceNow to really get a feel for how the response varies as a function of the two factorschosen for display, select View, 3D Surface. You then will see three-dimensionaldisplay of the response surface. If the coordinates encompass actual design points, thesewill be displayed.3D response surface plotThe Rotation tool allows you to view the 3D surface plot from any angle.22 • Mixture Tutorial – Part 1 Design-Expert 7 User’s Guide
DX7-05A-Mix-P1.doc Rev. 3/14/06Control for rotating 3D plotMove your cursor over the tool. The pointer changes to a hand. Now use the hand torotate the vertical or horizontal wheel. Watch the 3D surface change. It’s fun! What’sreally neat is how it becomes transparent so you can see hidden points falling below thesurface.Response PredictionTransparent view as surface is rotated, which allows points to be seen betterAlso, be aware that Design-Expert offers many options for 3D graphs via its preferences,which come up via a right-click over the plot. For example, if you don’t like thegraduated colors, go to the Graphs 2 tab and change the 3D graph to the hidden wireview (a transparent look).Press the Default button when you’re done playing. The graph then re-sets to its originalposition. Notice that you can also specify the horizontal (“h”) and vertical (“v”)coordinates.This feature in Design-Expert software falls under the Optimization branch, which willbe explored more fully in the next tutorial in this series. It allows you to generatepredicted response(s) for any set of factors. To see how this works, click on the PointPrediction node (lower left on your screen).Design-Expert 7 User’s Guide Mixture Tutorial – Part 1 • 23
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Mixture Design Tutorial (Part 1 â The Basics) - Statease.info

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Mixture Design Tutorial (Part 1 â The Basics) - Statease.info