Comparison of the Item Discrimination and Item Difficulty ...
[Pages:8]12
The International Journal of Educational and Psychological Assessment April 2009, Vol. 1, Issue 1, pp. 12-18
Comparison of the Item Discrimination and Item Difficulty of the Quick-Mental Aptitude Test using CTT and IRT Methods
Royce Hernandez De La Salle-College of Saint Benilde
Abstract The purpose of this research is to compare the item difficulty and item discrimination of the QuickMental Aptitude Test (Q-MAT) using Classical Test Theory and Item Response Theory (IRT) methods across 1, 2, and 3 parameters. The developed instrument was administered to a college sample of N=229. The data gathered was analyzed for possible relationship of the item characteristics using CTT and IRT methods. Results indicate that the 2 parameter IRT model closely resembles CTT of the verbal and non-verbal test in terms of item discrimination (R2verbal=.891, p ................
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