Examining of Internal Consistency Coefficients in Mixed-Format Tests in Different Simulation Conditions

Article History: Purpose: The present study aims to evaluate how the reliabilities computed using α, Stratified α, AngoffFeldt, and Feldt-Raju estimators may differ when sample size (500, 1000, and 2000) and item type ratio of dichotomous to polytomous items (2:1; 1:1, 1:2) included in the scale are varied. Research Methods: In this study, Cronbach’s α, Stratified α, Angoff-Feldt, and Feldt-Raju reliability coefficients were estimated on simulated datasets Received: 12 Mar. 2019 Received in revised form: 24 Feb. 2020 Accepted: 19 May. 2020 DOI: 10.14689/ejer.2020.87.5