The Effect of Option Differences on Psychometric Properties of Items in Likert-Type Scales

Likert-type scales are often used in education and psychology. In scales, response options/categories, like items, expected not to direct individuals’ responses. Although the researchers themselves make decision on how arrange categories during scale development, it is possible that different reveal behaviors. literature, has been observed differentiations number of forms studied more, yet there a limited studies investigating middle category with labels. Furthermore, also empirical conducted based polytomous Item Response Theory. This study, which was close this gap carried out 377 students. The options attitude were denominated labels, thus four generated. Only names changed first three forms, fourth form, graded. data obtained from analyzed using Graded Model Generalized Partial Credit depending After examination reliability parameters these relationships between according both models, inferences made as differences had an effect perceptions individuals.