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Selecting a Design

Click Select Design in the main design window. Since you defined four factors, ADX will display a list of all the available designs with four factors. The response surface design types available in ADX are described in Appendix A, "Glossary of ADX Terms," and in standard references such as Montgomery (1997), Myers and Montgomery (1995), and Box and Draper (1987). In addition, ADX generates designs described by Hartley (1959), where the factorial portion is a special nonregular fractional factorial. To select the central composite design, do the following:

1. Select the Central Composite: Orthogonal design.
   
   

   
   
   

   Click Axial Scaling to view how the axial runs will be generated. You have four choices: rotatable, orthogonal blocking, face center, or custom scaling. The choice affects the distance of the axial runs from the center of the design region.

2. Click OK to select the rotatable axial scaling for this design, and close the window to generate the design.