TY - JOUR JF - ijla JO - VL - 12 IS - 1 PY - 2009 Y1 - 2009/3/01 TI - Theoretical and Practical Comparison of Classical Test Theory and Item-Response Theory TT - مقایسه نظری و عملی دو نظریه کلاسیک سنجش و سوال-پاسخ N2 - 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. SP - 167 EP - 197 AU - Jalali, Sara AU - Kiany, Gholam Reza AD - Tarbiat Modarress University, Tehran KW - Item Response Theory (IRT) KW - Classical Test Theory (CTT) KW - Person statistics KW - Item statistics UR - http://ijal.khu.ac.ir/article-1-62-en.html ER -