Main Effects in Design of Experiments refers to the abstract isolation and quantification of individual independent variables on a dependent response within controlled experimental frameworks. The core theoretical mechanism relies on calculating marginal means or contrasts at specific levels to determine the unique contribution of each factor, excluding interactions between them. This concept belongs to the subfield of statistical design theory, specifically serving as the foundational metric for assessing variable significance before introducing complexity through interaction terms in factorial structures.
Prerequisite chain context: requires Two-Level Factor Structures for Variables.