Effect of Item Response Theory (IRT) Model Selection on Testlet-Based Test Equating IRT OSE

Author(s):: Cao, Yi; Lu, Ru; Tao, Wei
Publication Year:: 2014
Report Number:: RR-14-19
Source:: ETS Research Report
Document Type:: Report
Page Count:: 17
Subject/Key Words:: Item Response Theory (IRT), Testlets, Local Item Dependence, Dichotomous Items, Item Response Models, Polytomous Items, Testlet Models, True-Score Equating Method, Observed-Score Equating (OSE)

Abstract

And the number-correct equating using the 2PL is robust to the violation of local item independence.