Students with higher initial achievement in German benefited more from higher class mean achievement levels¶

Claim · All claims
Evidence · 1 study · associational r2 · q3
Currency · newest study 2025 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i? In German classes, the effect of class mean achievement on subsequent individual achievement was stronger for students with higher initial achievement (cross-level interaction). → Kopatz 2025

Evidence¶

Kopatz 2025¶

Kopatz, M., Wagner, W., Neuendorf, C., Trautwein, U., Nagengast, B., and Bardach, L. (2025). Class Composition Effects in Achievement and Interest and the Role of the Learning Environment Revisited: A Conceptual Replication and Extension of Lavrijsen et al. (2022). Preprint. https://osf.io/n5xur/?view_only=48daea427ab44c9abd13b21b1e2b42f6

q3 · i? · associational · r2

The abstract reports this cross-level interaction from multilevel models on the German sample: "students with higher initial achievement in German benefited more from higher class mean levels." The Educational Impact statement adds that being in a class with higher achieving classmates benefits higher achieving students in German but not in mathematics. No effect size is printed in the available text.

"Furthermore, students with higher initial achievement in German benefited more from higher class mean levels."

Discussion¶

Related Claims¶

• Class mean mathematics achievement composition effects were smaller and less often statistically significant than in the original Flemish study, underscoring the value of conceptual replications — related
• Class-average achievement shows a small negative indirect effect on subsequent mathematics achievement mediated through mathematics self-concept — related
• Within-class heterogeneity in achievement or interest did not directly predict outcomes, but differentiated instruction was particularly advantageous in more heterogeneous German classes — related
• Clique-average mathematics achievement negatively predicts the development of adolescents' academic self-concept (a BFLPE at the clique level) — related
• Equally able students have lower academic self-concepts in high-average-ability schools (the BFLPE), with a cross-national effect size of 0.49 — related