Dyadic data analysis with distinguishable dyads assesses the variance, not only between dyads, but also within the dyad when members are distinguishable on a known variable. In past research, the Actor-Partner Interdependence Model (APIM) has been the statistical model of choice in order to take into account this interdependence. Although this method has received considerable interest in the past decade, to our knowledge, no specific guide or tutorial exists to describe how to test an APIM model. In order to close this gap, this article will provide researchers with a step-by-step tutorial for assessing the most recent advancements of the APIM with the use of structural equation modeling (SEM). The present tutorial will also utilize the statistical program MPLUS.

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An unresolved and controversial issue in the perfectionism literature is whether perfectionism is beneficial, harmful, or unneeded. The model of excellencism and perfectionism (MEP) was recently developed to address this question by distinguishing the pursuit of perfection from the pursuit of excellence (Gaudreau, 2019). In this article, we report the results of the first empirical test of the core assumptions of the MEP. Across five studies (total N = 2,157), we tested the conceptual, functional, and developmental distinctiveness of excellencism and perfectionism. In Study 1, exploratory and confirmatory factor analyses with two samples supported the hypothesized two-factor structure of the newly developed Scale of Perfectionism and Excellencism (SCOPE). Study 2 provided evidence of convergent and discriminant validity from scores obtained from the SCOPE, and showed that, over and above excellencism, perfectionism was not associated with additional benefits (e.g., life satisfaction) or reduced harms (e.g., depression). Studies 3-4 focused on the academic achievement of undergraduates and showed that, compared to excellence strivers, perfection strivers more often aimed for perfect A+ grades (Study 3), but in fact achieved worse grades (Study 4). Study 5 adopted a four-wave longitudinal design with undergraduates and showed that excellencism and perfectionism were associated with an upward and a downward spiral of academic development. Overall, the results support the core assumptions of the MEP and show that perfectionism is either unneeded or harmful.

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