Item Response Theory Linking Methods for the Simple Multidimensional Item Response Theory Model and the Bifactor Model With Mixed Format

• In Event: Psychometrics and Educational Measurement Poster Session 1

Abstract

This study compares IRT linking methods for the simple MIRT model and the bifactor model with mixed format tests. For the study, two different IRT linking methods are considered: linking without linking coefficient methods (concurrent calibration (CC) and fixed item parameter calibration (FIPC)). The simulation results were explored with two different linking methods depending on the multidimensional structures (simple MIRT and bifactor model), item type (only MC item and mixed format test), and degree of ability equivalence among groups. The CC and the FIPC linking methods well recovered the item parameters. For the bifactor model, the FIPC linking method recovered parameters well, especially the difficulty parameters, whereas the CC linking method performed well for the simple MIRT model.

Authors

• Sohee Kim, Oklahoma State University

• Ki Cole, Oklahoma State University