Macros for the Design and Analysis of Experiments

Central Composite Design Macros: ADXCC File

The ADXCC file contains three macros that construct central composite designs. These designs are also known as Box-Wilson designs and are useful in response surface exploration. These designs have three components: a factorial portion, an axial portion, and centerpoints. The factorial portion is a fractional factorial design of resolution 5 or higher. The axial portion consists of runs with all factors except one at their central levels and the remaining factor at its highest and lowest values, respectively. The centerpoints are runs where all factors are at their central levels.

Central composite designs are especially suited to exploring a second-order response surface over several continuous factors. The designs are generally meant to be used after you have screened for the important factors with a two-level design (a fractional factorial design, for example).

Note that before including the ADXCC file, you must include both the ADXGEN file and the ADXFF file.

The ADXCC file contains three macros as follows:

ADXADCEN adds centerpoints to a central composite design.

ADXCCD constructs central composite designs.

ADXPCC lists available central composite designs.

The next three sections cover these three macros in the order shown in the list above.

Central Composite Design Macros: ADXCC File

ADXADCEN: Add Center Points

ADXCCD: Construct Central Composite Designs

ADXPCC: List Available Central Composite Designs

ADXADCEN	adds centerpoints to a central composite design.
ADXCCD	constructs central composite designs.
ADXPCC	lists available central composite designs.