This study employs Item Response Theory (IRT) in conjunction with Rasch measurement model. IRT
is an alternative measurement framework apart from Classical Test Theory (CTT). CTT is a psychometric technique that allows the presumption of test results, for instance the items’ difficulty and the individual’s aptitude. Meanwhile, IRT is a psychometric technique focusing on the response given by an individual to a particular test item as affected by the qualities of the item and individual background. IRT is more complex than CTT in terms of computation,but it has more advantages if compared to CTT. According to Magno, the estimates of item difficulty in IRT remain the same for two different samples, but not so in CTT. Besides, the difficulty indices of items in IRT are more constant than CTT. Moreover, in IRT, the internal consistencies of test do not change for two different samples, but they become unstable in CTT. Furthermore, IRT has considerably fewer measurement errors than CTT. To conclude, IRT is regarded as the best techniques to determine students’ achievement from time to time among the test-equating procedures
This study employs Item Response Theory (IRT) in conjunction with Rasch measurement model. IRTis an alternative measurement framework apart from Classical Test Theory (CTT). CTT is a psychometric technique that allows the presumption of test results, for instance the items’ difficulty and the individual’s aptitude. Meanwhile, IRT is a psychometric technique focusing on the response given by an individual to a particular test item as affected by the qualities of the item and individual background. IRT is more complex than CTT in terms of computation,but it has more advantages if compared to CTT. According to Magno, the estimates of item difficulty in IRT remain the same for two different samples, but not so in CTT. Besides, the difficulty indices of items in IRT are more constant than CTT. Moreover, in IRT, the internal consistencies of test do not change for two different samples, but they become unstable in CTT. Furthermore, IRT has considerably fewer measurement errors than CTT. To conclude, IRT is regarded as the best techniques to determine students’ achievement from time to time among the test-equating procedures
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