This study conducted a comprehensive comparison of Item Response Theory (IRT) linking methods applied to a bifactor model, examining their performance on both multiple choice (MC) and mixed format tests within the common item nonequivalent group design framework. Four distinct multidimensional IRT linking approaches were explored, consisting of…

Differential item functioning (DIF) often arises from multiple sources. Within the context of multidimensional item response theory, this study examined DIF items with varying secondary dimensions using the three DIF methods: SIBTEST, Mantel-Haenszel, and logistic regression. The effect of the number of secondary dimensions on DIF detection rates…

International surveys are increasingly being used to understand nonacademic outcomes like math and science motivation, and to inform education policy changes within countries. Such instruments assume that the measure works consistently across countries, ethnicities, and languages--that is, they assume measurement invariance. While studies have…

A new Spanish version of the Cognitive Test Anxiety Scale (CTAS) was created to be used explicitly with Argentinean university students. The scale was translated and verified through blind back translation and given to a large sample of students majoring in psychology or chemistry (N = 752). Exploratory Factor Analysis (N = 376) showed an internal…

Testing is essential in education and other social science fields because many assessments, decisions, and policies are made according to the results of testing. The purpose of testing is to estimate a person's ability, that is, latent trait or construct. In a test setting, responses to a set of test items by each individual are recorded. Through…