Abstract

SANTOS, Marcos Antonio da Cunha  and  SOARES, José Francisco. Estimativas não paramétricas das curvas características dos itens em testes educacionais. Est. Aval. Educ. [online]. 2012, vol.23, n.52, pp.130-144. ISSN 0103-6831.

The proficiency of students taking a test to measure a certain competence or ability is usually estimated using the Item Response Theory model; the adjustment to the items defines the quality of the estimate. Thus, in a real testing situation, a preliminary analysis of the items is carried out in order to select the items which, because they present an empirical anomalous behavior, should be excluded from the analysis. The aim of this paper is to present a set of procedures implemented as a macro of the free R software, which produce this preliminary analysis in a simple and interactive way. Furthermore, this macro implements a nonparametric estimate of the curves which are characteristic for each answer choice, the kind of information that is not available in other software and which is a powerful descriptive tool of the items.

Keywords : Item Response Theory; Learning Assessment.

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