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In analysis of variance (ANOVA), the property of having only main effects and no interaction effects and thus being represented by an additive model without multiplicative terms. In axiomatic measurement theory, a property of a quantitative attribute such that for any two levels of the attribute, a third always exists such that the greatest of the three levels is the sum of the other two. The absence of this property is called non-additivity. additive adj.

Subjects: Psychology.

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