Table 2 Types of interaction between two independent variables and dependent variables
Criterion | Interaction |
|---|---|
q(x1,x2) < Min(q(x1),q(x2)) | Nonlinear weakening |
Min(q(x1),q(x2)) < q(x1,x2) < Max(q(x1),q(x2)) | Single-factor nonlinear weakening |
q(x1,y) > Max(q(x1),q(x2)) | Bi-enhancement |
q(x1,y) = q(x1) + q(x2) | Independent |
q(x1,y) > q(x1) + q(x2) | Nonlinear enhancement |