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In the presence of a significant effect two of the

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Unformatted text preview: . In the presence of a significant effect, two of the possible approaches include (i) dependent variable contribution and (ii) multivariate contrasts. In the dependent variable contribution approach, dependent variables are removed one at a time and MANOVA is performed with the remaining dependent variables to examine how much change is induced in the significance of an effect by the removal of a dependent variable (18). Besides dependent variable contribution, multivariate contrasts may be constructed to assess differences among significant independent variables. Several criteria used for gauging multivariate differences among independent variables are Roy’s gcr, Wilks’ lambda (or U statistic), Hotelling’s trace, and Pillai’s criteria. Although Wilks’ lambda is most often used and reported in research articles, the choice of any criterion is guided by the degree at which the assumptions underlying MANOVA are satisfactorily met (7,18). Correspondence analysis. Correspondence analysis describes relationships among two or more cross-tabulated categorical variables (con...
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