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Developing Cross-Cultural Measurement in Social Work Research and Evaluation$
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Thanh Tran, Tam Nguyen, and Keith Chan

Print publication date: 2017

Print ISBN-13: 9780190496470

Published to Oxford Scholarship Online: February 2018

DOI: 10.1093/acprof:oso/9780190496470.001.0001

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Item Response Theory in Cross-Cultural Measurement

Item Response Theory in Cross-Cultural Measurement

Chapter:
(p.91) 5 Item Response Theory in Cross-Cultural Measurement
Source:
Developing Cross-Cultural Measurement in Social Work Research and Evaluation
Author(s):

Thanh V. Tran

Tam Nguyen

Keith Chan

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780190496470.003.0005

Item response theory (IRT) is a modern measurement theory that, as its name implies, focuses mainly at the item level as opposed to the test level. The underlying principle of IRT is that a relationship exists between an individual’s ability and how the individual responds to items on a test. IRT offers item-level details not provided through classical approaches. The aims of this chapter are to (1) provide a brief overview of IRT, (2) demonstrate the basic features of IRT using existing data, and (3) walk the reader through the key steps in conducting IRT analysis using IRTPRO®. IRT has also increasingly been used to develop, shorten, and refine psychosocial instruments.

Keywords:   item characteristic curve, item invariance, differential item functioning, 2 parameter logistic (2PL) model, graded response model, unidimensional IRT

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