Item Response Theory Analysis of the Western Aphasia Battery

Hula, William and Donovan, Neila and Kendall, Diane and Gonzalez Rothi, Leslie (2009) Item Response Theory Analysis of the Western Aphasia Battery. [Clinical Aphasiology Paper]

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The purpose of this investigation was to improve the validity of the Western Aphasia Battery for measuring aphasia severity and change over time by examining its fit to an item response theory (IRT) measurement model. The advantages of IRT include interval scaling, potential for equating scores across aphasia tests, and more veridical reporting of score reliability. Despite reasonable overall fit to the model, a small number of WAB items demonstrated substantial misfit, suggesting that they do not productively contribute to the measurement of aphasia severity. Potential explanations for this misfit, and implications of IRT for aphasia testing will be discussed.

Item Type: Clinical Aphasiology Paper
Additional Information: USED WITH PERMISSION.
Depositing User: Gabler Vanessa
Date Deposited: 29 Oct 2010
Last Modified: 31 Oct 2016 15:13
Conference: Clinical Aphasiology Conference > Clinical Aphasiology Conference (2009 : 39th : Keystone, CO : May 26-30, 2009)

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