The degree of a lattice determines where (vertices, edges, or faces) points are put in a mixture design. In a simplex lattice design, points are arranged in a uniform way (lattice).
Unaugmented - Simplex degree of lattice 1
Lets you fit a linear model.
Unaugmented - Simplex degree of lattice 2
Lets you fit up to a quadratic model.
Unaugmented - Simplex degree of lattice 3
Lets you fit up to a full cubic model.
Augmented - Simplex degree of lattice 1
Lets you partially fit up to a quadratic model.
Augmented - Simplex degree of lattice 2
Lets you partially fit up to a special cubic model.
Augmented - Simplex degree of lattice 3
Lets you fit up to a full cubic model.
