Journal
STRUCTURAL EQUATION MODELING-A MULTIDISCIPLINARY JOURNAL
Volume 25, Issue 1, Pages 86-100Publisher
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/10705511.2017.1367926
Keywords
categorical factor analysis; item response theory; outliers; person-fit
Funding
- National Cancer Institute [1U2-CCA186878-01]
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Mahalanobis distance (M-distance) case diagnostics are a useful tool for assessing response pattern inconsistency in factor analysis; however, the derivations of these statistics assume continuous variables, which limits their utility in ordinal self-or rater-report data. This research generalizes M-distance diagnostics to categorical factor analysis. We prove that the residual-based M-distance d(r) is equivalent to the person-fit index lco, which motivates the use of the new categorical M-distance d(r)* as a person-fit index. d(r)* is compared and contrasted with zh, a commonly used item response theory person-fit index. A simulation study is used to show that a simple transformation of d(r)* satisfies established criteria for person-fit measures. A sample of responses to the Rosenberg Self-Esteem Scale is used to determine parameters for a simulation study, and real data are analyzed to contrast the use of d(r) and d(r)* as indexes of person-fit in continuous and categorical factor analysis.
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