Abstract

ABAL, Facundo et al. Application of thissen & steinberg's model to the analysis of the items of a logical criterion test. Anu. investig. [online]. 2005, vol.12, pp.163-171. ISSN 1851-1686.

Item analysis of a test named Logical Criterion was made within the frame of the Classical Test Theory (CTT) and by means of the Thissen & Steinberg's model of the Item Response Theory. The results obtained from both analysis are compared and the hypothesis of the polytomous model being more demanding as regards quality requirements is confirmed. The thirty items that make up this test were analyzed. As a result, those which were acceptable from the polytomous point of view were satisfactory also for the CTT, while some items that might be accepted in the CTT showed failures in the polytomous analysis. These situations are illustrated by three examples. Twenty six items turned out to be acceptable for the CTT but only seven of them achieved the requirements regarding quality that polytomous analysis needed. The analysis of the curves was useful to detect those that could be improved, as well as the way of improving them, and what kind of situations are to be avoided in the future construction of new items.

Keywords : Thissen & Steinberg's Polytomous Model; Item Analysis; Item Response Theory.

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