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Structural Validity of the OSA Figures Scale for the Online Self-Assessment of Fluid Reasoning

This investigation provides evidence of the structural validity related to scores from the Online Self-Assessment (OSA) Figures scale. This scale was constructed for the assessment of figural reasoning as part of an online self-assessment battery. Since the appropriateness of confirmatory factor analysis (CFA) of data obtained by dichotomous items has been questioned, two suitable methods including different link transformations were considered: (1) confirmatory factor analysis including the congeneric model of measurement with tetrachoric correlations as input and (2) confirmatory factor analysis according to the weighted congeneric model with probability-based covariances as input. The models tested a unidimensional structure for the scale. Support for structural validity was identified through acceptable model-data fit indices and convergence of the parameter estimates across analysis methods. Furthermore, the OSA Figures scale showed an acceptable degree of homogeneity according to McDonald’s Omega and substantial correlation with course scores.