Item Characteristics Analysis Using the Rasch Model in the Development of Quantitative Literacy Instruments For Elementary Schools Students

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Dameis Surya Anggara, Kadir, Herwindo Haribowo


This research is part of the development of quantitative literacy instruments for elementary school students. This study aims to analyze the characteristics of items from the device, namely the validity of the internal structure, the reliability of internal consistency, and the differential item function [DIF]. The instruments developed were 40 multiple-choice items constructed from interpretation, representation, calculation, assumptions, analysis, and communication skills. Furthermore, the device was tested on 480 elementary school students in Semarang City and Demak Regency, Indonesia. The collected data were analyzed using the Rasch Model approach to determine the characteristics of the items. The results showed 30 items out of 40 things that had valid criteria with Outfit ZSTD values ​​between -2.0 and +2.0. The instrument's reliability has the right standards with a Cronbach Alpha (KR-20) value of 0.70, and item reliability has particular criteria with an item reliability value of 0.99. Then, from 30 valid items, free from DIF with the mantel-haenszel probability value for each item is more than 0.05.


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