Abstract
Multi-group confirmatory factor analysis (MGCFA) is a common tool for testing factorial invariance within structural eqaution modeling (SEM) framework; however, a two-part factor model might be more appropriate for zero-inflated measures due to the severe non-normality of the data. Nevertheless, testing the factorial invariance of zero-inflated variables using the two-part factor model is uncommon. To fill that gap in the literature, the current study demonstrated the use of two-part factor model for testing factorial invariance of highly zero-inflated measures and compared the result to the MGCFA’s. The two models led to different factorial invariance results on the zero-inflated measures. The two-part factor model supported full scalar invariance of the continuous-part model whereas the MGCFA concluded only partial metric invariance. Thus, applying a different factor model brought different conclusions about factorial invariance when the measures were zero-inflated.
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