Center point
Main Help
RSM
Setting up a RSM
RSM Array
• Rotatable
• Center point
Formula
Design of experiments (DOE)
Full version of DevelveFor commercial use 75 EURO
RSM
Setting up a RSM
RSM Array
• Rotatable
• Center point
Formula
Design of experiments (DOE)
Full version of DevelveFor commercial use 75 EURO
Main Help
Factorial Arrays
Full Factorial Array
Orthogonal Array
Plackett–Burman Array
Box-Behnken design
Central Composite design Design of experiments (DOE)
RSM
Factorial Arrays
Full Factorial Array
Orthogonal Array
Plackett–Burman Array
Box-Behnken design
Central Composite design Design of experiments (DOE)
RSM
Center points are half way between all the high and low values in the experiment so they are in the center (the row with only 0 in the array).
Why are Center points used?
-
To determine if a relation is linear or not
Measure the stability and the variation during the experiment
To increase the statistical power of a design
Examples
CCD2
| Tests | Factors | |
| A | B | |
| 1 (Center point) | 0 | 0 |
| 2 | -1 | -1 |
| 3 | 1 | -1 |
| 4 (Center point) | 0 | 0 |
| 5 | -1 | 1 |
| 6 | 1 | 1 |
| 7 (Center point) | 0 | 0 |
| 8 | -1.414 | 0 |
| 9 | 1.414 | 0 |
| 10 (Center point) | 0 | 0 |
| 11 | 0 | -1.414 |
| 12 | 0 | 1.414 |
| 13 (Center point) | 0 | 0 |
.png) |
| Graphical image of the CCD2 array |
More images of designs with center points
%20Number.png) Center point in a Central Composite design  Center point in a Box-Behnken design |
| Blue Center point |