A psychometric analysis of the Sensitivity to Injustice Questionnaire using classical test theory and item response theory
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A psychometric analysis of the Sensitivity to Injustice Questionnaire using classical test theory and item response theory
Abstract
The study analyzes psychometric properties of the Sensitivity to Injustice Questionnaire (SIQ) using both classical test theory (CTT) and item response theory (IRT) methods. The research was conducted on the Slovak sample of 495 individuals (194 males) – mean age 26.3 (SD = 9.95). CTT confirmed that most of the items contributed well to internal consistency of the scale. The Samejima’s graded response model showed that all of the items had at least moderate discrimination values and the threshold parameters indicate that the most items had the first category responses below the mean trait level, the second and third were above the mean trait level. Information function of the scale also revealed that the scale is more informative in persons with moderate and high level of sensitivity to injustice. Item analysis showed that both informations from CTT and IRT analysis could provide practical advice for improving scale properties and item-selection.
Keywords
Item response theory. Classical test theory. Semajima´s graded response model. Sensitivity to injustice. Psychometric analysis.
Poster presented at ECP 2011 - The 12th European Congress of Psychology : Istanbul 2011, 4. – 8. July.
The congress is organized under the auspices of The European Federation of Psychologists Associations (EFPA).
The European Congress of Psychology (ECP) is held every second year followed by the EFPA General Assembly. The next congress, ECP 2013, will be held in Stockholm, Sweden.