Accuracy in parameter estimation and simulation approaches for sample-size planning accounting for item effects. - Buchanan EM; Elsherif MM; Geller J; Aberson CL; Gurkan N; Ambrosini E; Heyman T; Montefinese M; Vanpaemel W; Barzykowski K; Batres C; Fellnhofer K; et al. (Behavior research methods, 2026)