This macro selects a D-optimal design from either a 2-level factorial design or a central composite design as the base design. This D-optimal design will be able to estimate all main effects, all 2-way interactions and, if a central composite base design is specified, all quadratics.
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For a factorial design with text factors use the coded levels -1 for low and +1 for high. For a central composite design, the low and high levels are for the cube points and the factors are assumed to be continuous.
The D-optimal design is stored in the same worksheet as the factor name and level columns beginning in columns C4 and beyond. Any data stored in these columns before the macro is run may be lost.
If a 2-level factorial base design is selected, when analyzing the experiment in Terms list and select Include terms up through order 2., click the
The Initial D-Optimal design is generated by Sequential Optimization. The Exchange method with 1 exchange point is employed for Improving the Initial Design.