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Location Indices for Ordinal Polytomous Items Based on Item Response Theory ICRFs IRT

Author(s):
Ali, Usama S.; Chang, Hua-Hua; Anderson, Carolyn.
Publication Year:
2015
Report Number:
RR-15-20
Source:
ETS Research Report
Document Type:
Report
Page Count:
15
Subject/Key Words:
Graded Response Model, Item Category Response Functions (ICRFs), Item Response Theory (IRT), Polytomous Items

Abstract

The ICRF approach resulted in three indices: LImean, LItrimmed mean, and LImedian, and the IRF approach resulted in one proposed index, LIIRF. An empirical example of real items is presented to help comprehension of the new location indices. Possible testing applications where the proposed item location indices are useful are discussed.

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