Table 2 Classification of interaction results.

From: A combined model method was used to identify the main influencing factors of soil heavy metal pollution sources in Qian river, China

Interactive results

Explanatory power

Nonlinear attenuation

q (x1∩ x2) < Min [q(x1), q(x2)]

Single-factor attenuation

Min [q(x1), q(x2)] < q (x1∩ x2) < Max[q(x1), q (x2)]

Mutually independent

q (x1∩x2) = q(x1) + q (x2)

Two-factor enhancement

q (x1∩ x2) > Max [q (x1), q (x2)]

Nonlinear enhancement

q (x1∩ x2) > q (x1) + q (x2)

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