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Table 2 Types of interaction between two factors on dependent variables

From: The superposition effects of air pollution on government health expenditure in China— spatial evidence from GeoDetector

Description Interaction
q(× 1∩× 2) < Min(q(x), q(× 2)) Nonlinear weakening
Min(q(× 1), q(× 2)) < q(× 1∩× 2) < Max(q(× 1), q(× 2)) Single factor nonlinear weakening
q(x1∩x2) > Max(q(× 1), q(× 2)) Two factor enhancement
q(×1∩×2) = q(× 1) + q(× 2) Independence
q(x1∩x2) > q(× 1) + q(× 2) Nonlinear enhancement