Ortak Maddelerin Değişen Madde Fonksiyonu Gösterip Göstermemesi Durumunda Test Eşitlemeye Etkisinin Farklı Yöntemlerle İncelenmesi
Demirus, Kadriye Belgin
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The purpose of this study to compare the results of equating methods based on Item Response Theory when all the anchor items showing or not showing gender based uniform DIF. In the study the effect of items with DIF on test equating presented on real data with horizontal equating using seperate calibration methods and equivalent groups with anchor test design.DIF analysis conducted on EASDIF software for Mantel-Haenszel method and on SPSS with syntax presented by Zumbo for logistic regression method. For test equating methods mean- mean , mean-sigma , Haebara" and "Stocking-Lord" were used. The performance of the equating methods were evaluated through RMSD equating errors. BILOG-MG was utilized for the prediction of item parameters and ability, IRTEQ software was utilized for test equating.