Detecting and Investigating Polytomous Items with Nonuniform-bidirectional Drift

• In Event: Differential Item Functioning II

Abstract

The Monte Carlo simulation was employed to model two testing administrations, encompassing 81 scenarios, where polytomous items demonstrated nonuniform-bidirectional drift. The findings revealed notable impacts of the drift on distinct ability groups and substantiated the efficacy of the Weighted Root Mean Square Difference in identifying nonuniform-bidirectional drift over conventional methods.

Authors

• Hao Jia, National Council of State Boards of Nursing NCSBN

• William J Muntean, National Council of State Boards of Nursing

• Joe Betts, NCSBN

• Zhuoran Wang, National Council of State Boards of Nursing (NCSBN)