In statistics, the situation in which the simultaneous influence of two variables on a third is not additive
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Y = c + ax_1 + bx_2 + \text{error} 3 identifiers linking interaction across the web's reference databases
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In statistics, an interaction may arise when considering the relationship among three or more variables, and describes a situation in which the effect of one causal variable on an outcome depends on the state of a second causal variable. Although commonly thought of in terms of causal relationships, the concept of an interaction can also describe non-causal associations. Interactions are often considered in the context of regression analyses or factorial experiments.