APPLICATION OF ITEM RESPONSE THEORY IN DETERMINING DISCRIMINATION AND DIFFICULTY OF ITEMS

Abstract

Two item response theory measurement models were focused here in the context of their potential usefulness in education setting such as determining discrimination and difficulty of item Researchers often interested in studying abilities, personality traits, item discrimination and difficulty with other unobservable characteristics which can be quantified with instrument such as test, questionnaires and so on. In educational measurement, a discrete item response is usually the observable outcome variable, and the latent variable is associated with an examinee’s trait level (e. g., skill, proficiency). The link between the two variables is called an item response function, this function, defined by a set of item parameters, models the probability of observing a given item response, conditional on a specific trait level.