Abstract
Relationship between the influence analyses based on influence function (R-mode analysis) and on Cook's local influence (Q-mode analysis) is discussed. The equivalent results are obtained under general conditions by these influence analyses in statistical modelling without/with equality constraints, if the same perturbation is introduced in both analyses. The equivalence holds in most normal theory multivariate methods including regression analysis, principal component analysis, canonical correlation analysis, exploratory and confirmatory factor analyses, and covariance structure analysis with or without equality constraints.
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