Fraction of Design Space Plot

In the Compare Designs report, the Fraction of Design Space Plot shows the proportion of the design space over which the relative prediction variance lies below a given value.

Figure 17.15 Fraction of Design Space Plot for Three Designs 

Note the following:

• The X axis in the plot represents the proportion of the design space, ranging from 0 to 100%.

• The Y axis represents relative prediction variance values.

• For a point (x, y) that falls on a given curve, the value x is the proportion of design space with variance less than or equal to y.

• Red dotted crosshairs mark the value that bounds the relative prediction variance for 50% of design space for the reference design.

Use the crosshairs tool to find the maximum relative prediction variance that corresponds to any Fraction of Space value. For example, use the crosshairs tool to see that for the 24-run design, 90% of the prediction variance values are below approximately 0.20.

Note: Plots for the same design might vary slightly, since random sampling of the design space is used in constructing the Fraction of Design Space Plot.