Exploring the Accuracy of MIRT Scale Linking Procedures for Mixed-format Tests

Abstract

This study investigates the accuracy of Stocking-Lord scale linking procedures for UIRT and MIRT models with common-item nonequivalent-group design for mixed-format tests under two anchor conditions: MC-Only and MC-CR across three different levels of format effects (FEs). Results provide recommendations on the appropriateness of UIRT and two MIRT models when FEs present under each anchor scenario.