Table 1. Types of interactions between the two covariates.
Criterion | Interaction |
---|---|
q (X1 ∩ X2) < Min (q(X1), q(X2)) | nonlinearly weakened |
Min (q(X1), q(X2)) < q(X1 ∩ X2) < Max(q(X1), q(X2)) | unilaterally nonlinearly weakened |
q(X1 ∩ X2) > Max(q(X1), q(X2)) | bilaterally enhanced |
q(X1 ∩ X2) = q(X1) + q(X2) | independent |
q(X1 ∩ X2) > q(X1) + q(X2) | nonlinearly enhanced |