Aynı Tepki Kategorilerine Sahip Likert Maddelerin Psikometrik Özelliklerinin Çok Kategorili Madde Tepki Kuramı Modelleri ile İncelenmesi

Abstract

The purpose of this study was to investigate within- and between-threshold parameter invariance for items of afourteen-item Positive Affect Scale developed to assess positive moods (like happy, peaceful, etc.) of universitystudents. To test whether the estimated threshold parameters were as expected (1 to 5, with increments of 1)across all the 14 items, Graded Response, Partial Credit, and Rating Scale Models were fit the response datacollected from 326 students. A comparison of the model fit statistics, such as the negative 2log likelihood andchi-square values, revealed that the Graded Response Model had the best fit and that the thresholds estimates forall the items in the Positive Affective Scale were reasonably close to the expected 1 to 5 values with incrementsof 1. The study illustrates how polytomous response models can be used to test the psychometric quality of itemswith ordinal rating scales.