title: Item Overlap Correlations: Definitions, Interpretations, and Implications.
abstract: Four item overlap coefficient (IOC) formulae have been proposed in the literature to measure the effects of overlapping items on the relation of scales which share these items. 10C derivations of this article lead to (a) six caveats concerning the calculation and interpretation of IOCs, and (b) six possible explanations of why the factor structures of MMPI and MCMI scales appear to be strongly influenced by item overlap.
authors.forename: L M
authors.initials: LM
authors.lastname: Hsu