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Las escalas tipo Likert desde su aparicion y difusion han tenido gran acogida y son consideradas como uno de los metodos mas adecuados para construir tests psicologicos. Ademas, se asume que mientras mas opciones tengan se obtendra mayor informacion acerca del individuo y por tanto presentara mejores propiedades psicometricas. El objetivo de este trabajo fue evaluar la pertinencia del uso de diferentes formatos de respuestas dentro de una escala tipo Likert. Se realizaron analisis psicometricos en los diversos formatos propuestos en la escala (analisis de items, confiabilidad y estructura factorial). Se encontraron similitudes en cuanto a las caracteristicas psicometricas de cuatro formatos propuestos. Se concluye que el formato establecido no afecta las propiedades psicometricas del instrumento como la confiabilidad y validez. Polytomous or dichotomous items? An empirical study with an unidimensional scale: Likert scales from its apparition and diffusion have been well received and are considered one of the best methods to build psychological testing. Furthermore, it is assumed than if have more response options, you will have more information about the individual, and better psychometric properties. The aim of this study was to evaluate the relevance of the use of different formats for answers in a Likert-type scale. Were conducted psychometric analyzes in various formats proposed in the scale (item analysis, reliability and factor structure). Were found similarities in terms of the psychometric characteristics of four formats proposed. We conclude that both politomous and dichotomous formats provide important information as to the reliability and validity of the instrument.

¿Ítems Politómicos o dicotómicos? Un estudio empírico con una escala unidimensional