RT - Journal Article T1 - Theoretical and Practical Comparison of Classical Test Theory and Item-Response Theory JF - ijla YR - 2009 JO - ijla VO - 12 IS - 1 UR - http://ijal.khu.ac.ir/article-1-62-en.html SP - 167 EP - 197 K1 - Item Response Theory (IRT) K1 - Classical Test Theory (CTT) K1 - Person statistics K1 - Item statistics AB - Classical test theory and item response theory are widely perceived as representing two very different measurement frameworks. Few studies have empirically examined the similarities and differences in the parameters estimated using the two frameworks. The purpose of this study was to examine how item statistics (i.e. item difficulty and item discrimination) and person statistics (i.e. ability estimates) behave under the two measurement frameworks i.e.CTTandIRT. The researchers tried to compare the two models from both theoretical and practical perspectives. For this purpose, first, a theoretical comparison of the two models was carried out then, a sample of 3000 testees taking part in the English language university entrance exam was used in order to compare the two models practically. The findings showed that person statistics from CTT were comparable with those from IRT for all three IRT models. Item difficulty indexes from CTT were comparable with those from all IRT models and especially from the one-parameter logistic (1PL) model. Item discrimination indexes from CTT were somewhat less comparable with those from IRT. LA eng UL http://ijal.khu.ac.ir/article-1-62-en.html M3 ER -