Supplementary material for: I will give a little help to my friend - Validation of the German Prosocial Behavior Intention Scale (PBIS-G)

Electronic supplementary material for: Lorenz, T., & Binder, B. (2023). I Will Give a Little Help to My Friend–Validation of the German Prosocial Behavior Intention Scale (PBIS-G). Psychological Test Adaptation and Development, 4(1), 55-65. https://doi.org/10.1027/2698-1866/a000032

The present study adapts and investigates the psychometric properties of the German version of the Prosocial Behavioral Intentions Scale (PBIS). The sample included 507 participants. Incongruent with the original study, the PBIS showed low internal consistency (α = .57; ω = .63). The CFA results indicated a good two-dimensional model fit. The PBIS scores showed convergent validity with related instruments. A positive correlation with materialism was observed, so no statements on discriminant validity were made. Additional measurement invariance testing with an existing US sample showed configural measurement invariance, indicating differences in the mode of action in both cultures. Based on these results, the PBIS-G should be used with caution, and further psychometric testing should be conducted to examine discriminant validity and the origin of missing measurement invariance.