EDPS 735 Item Response Theory
Item Response Theory (IRT) involves the study of statistical methods for analyzing and interpreting responses to items on cognitive and affective scales. Focuses on statistical models for such responses, with special emphasis on assessment of model fit, assumption violations, and reporting of results. Extensions of standard IRT models are also discussed, including multidimensional IRT, differential item functioning assessment, methods for scaling and equating, and models for unfolding type data. Students will learn both the theory underlying IRT, and how to use these models in practice with computer software. Prerequisite: EDPS 641 or 642.