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    Area of Science:

    • Psychology
    • Quantitative Psychology
    • Methodology

    Background:

    • Critically examines Jackson's (1975) revised multimethod factor analysis.
    • Evaluates Jackson's critique of Golding and Seidman's (1974) two-step principal components procedure.

    Purpose of the Study:

    • To assess the empirical and conceptual validity of Jackson's (1975) multimethod factor analysis.
    • To clarify the role of method variance in multimethod research.

    Main Methods:

    • Conceptual analysis of Jackson's (1975) multimethod factor analysis.
    • Examination of the critique of Golding and Seidman's (1974) procedure.
    • Theoretical argument regarding method variance and nomological networks.

    Main Results:

    • Jackson's revised method, while empirically defensible, rests on potentially unwarranted conceptual assumptions.
    • Jackson's critique of the Golding-Seidman method may be misleading.
    • Method variance is best understood as an inherent aspect of the nomological structure of a construct.

    Conclusions:

    • Multimethod investigations require explicit specification of nomological assumptions for trait-method units.
    • Failure to specify these assumptions leads to conceptually and empirically unsound research.
    • A more nuanced understanding of method variance is crucial for robust multimethod factor analysis.