Point | Screening Designs | Factorial Designs | Response Surface Designs | Mixture Designs |
---|---|---|---|---|
0 | center point | center point | center point | centroid |
1 | corner point | corner point (cube point) | cube point (corner point) | vertex |
-1 | - | - | axial point | axial point |
2 | edge midpoint* | - | edge midpoint** | edge midpoint (double blend) |
3 | - | - | - | triple blend*** |
*Applies only to definitive screening designs.
**Applies only to Box-Behnken designs.
***In mixture designs, the point type increases naturally (or respectively) with higher order blends.