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Psicothema was founded in Asturias (northern Spain) in 1989, and is published jointly by the Psychology Faculty of the University of Oviedo and the Psychological Association of the Principality of Asturias (Colegio Oficial de Psicólogos del Principado de Asturias).
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Psicothema, 2008. Vol. Vol. 20 (nº 4). 851-856




Características de forma y contenido que predicen la capacidad discriminativa en ítems de personalidad: un análisis basado en la Teoría de Respuesta a los Ítems

Pere Joan Ferrando Piera y Josep Demestre Viladevall

Universidad Rovira i Virgili

En dos conjuntos de ítems de personalidad que miden extraversión y neuroticismo se estudian las relaciones entre tres grupos de características itemétricas y los índices de discriminación estimados de acuerdo con el modelo TRI de dos parámetros. Las características itemétricas, que se conceptualizan como dimensiones, son: complejidad verbal, ambigüedad e indicatividad, y las hipótesis con respecto a su impacto sobre la capacidad discriminativa se derivan desde un modelo de estadios de procesamiento. La dimensión de indicatividad es la que muestra relaciones más claras con la capacidad discriminativa en la dirección esperada. Se discuten las implicaciones de los resultados cara a la elaboración de medidas en personalidad.

Content and form characteristics that predict discriminating power in personality items: An Item Response Theory-based analysis. In two personality item pools that measure extraversion and neuroticism, the relations between three groups of itemmetric properties and the estimated discrimination indexes according to the two-parameter model are assessed. The itemmetric properties, which are conceptualized as dimensions, are: verbal complexity, ambiguity, and trait indicativity, and the hypotheses concerning their impact on the discriminating power are derived from a processing-stage model. The dimension of trait indicativity shows the clearest relations with the discriminating power in the expected direction. The implications of the results in the construction of personality measures are discussed.

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