Detecting DIF in Polytomous Items Using MACS, IRT and Ordinal Logistic Regression

  1. Paula Elosua 1
  2. Craig S. Wells 2
  1. 1 University of the Basque Country (Spain)
  2. 2 University of Massachusetts, Amherst (USA)
Revista:
Psicológica: Revista de metodología y psicología experimental

ISSN: 1576-8597

Año de publicación: 2013

Volumen: 34

Número: 2

Páginas: 327-342

Tipo: Artículo

Otras publicaciones en: Psicológica: Revista de metodología y psicología experimental

Resumen

El objetivo de este trabajo fue comparar el error Tipo I y la potencia de tres métodos de detección de funcionamiento diferencial del ítem en respuestas politómicas. Se compararon dos procedimientos basados en los modelos de estructuras de medias y covarianzas (MACS) y la teoría de respuesta al ítem (IRT) con un tercer procedimiento de puntuación observada, la regresión logística ordinal. Se utilizó simulación Montencarlo para generar datos según el modelo de respuesta graduada de Samejima. Se manipularon tres factores: tamaño de la muestra por grupo (300-, 500-, y 1,000- sujetos), tipo de DIF (b-parámetro, a-parámetro y a- y b parámetros), y magnitud de DIF (pequeño y grande). El error tipo I en presencia de DIF fue mayor que el esperado para la TRI y la regresión logística ordinal. Para la condición de DIF uniforme, MACS y TRI mostraron potencias similares, sin embargo, la regresión logística ordinal mostró una potencia algo superior al resto para tamaños de muestra pequeños. En las condiciones de DIF no uniforme, la potencia de la TRI fue mayor que MACS y la regresión logística ordinal.

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