Funnel-plot asymmetry ran contrary to small-study effects because larger-sample studies reported larger effect sizes, likely reflecting longer training programs¶

Claim · All claims
Evidence · 1 study · quant-synthesis r? · q3 · i1 small
Currency · newest study 2025 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i1 Egger's test among published studies was significant, but asymmetry ran contrary to small-study effects: smaller standard errors were associated with larger effect sizes (r = −0.14) and longer training durations (r = −0.19). → Donath 2025

Evidence¶

Donath 2025¶

Donath, J. L., Lüke, T., Tran, U. S., Botes, E., & Goetz, T. (2025). The Transfer of Teacher Training to Inclusive Classroom Practice: A Meta-Analytic SEM Approach. Educational Psychology Review. https://doi.org/10.1007/s10648-025-10081-9

q3 · i1 · quant-synthesis · r?

Publication-bias analyses using multilevel Egger's regression and power-enhanced funnel plots on published studies. The article reports the asymmetry direction was "contrary to small-study effects" and attributes it to higher-power studies investigating more extended training programs; median study power was low (22.3%).

"smaller standard errors of effect sizes were associated with both larger effect sizes (r = −0.14 [−0.22; −0.05], p = 0.002) and longer training durations in the studies (r = −0.19 [−0.27; −0.10], p < 0.001)."

Discussion¶

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