NDLI: Item Response Theory Modeling of the Philadelphia Naming Test.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Fergadiotis, Gerasimos Kellough, Stacey Hula, William D.
Abstract	Purpose: In this study, we investigated the fit of the Philadelphia Naming Test (PNT; Roach, Schwartz, Martin, Grewal, & Brecher, 1996) to an item-response-theory measurement model, estimated the precision of the resulting scores and item parameters, and provided a theoretical rationale for the interpretation of PNT overall scores by relating explanatory variables to item difficulty. This article describes the statistical model underlying the computer adaptive PNT presented in a companion article (Hula, Kellough, & Fergadiotis, 2015). Method: Using archival data, we evaluated the fit of the PNT to 1- and 2-parameter logistic models and examined the precision of the resulting parameter estimates. We regressed the item difficulty estimates on three predictor variables: word length, age of acquisition, and contextual diversity. Results: The 2-parameter logistic model demonstrated marginally better fit, but the fit of the 1-parameter logistic model was adequate. Precision was excellent for both person ability and item difficulty estimates. Word length, age of acquisition, and contextual diversity all independently contributed to variance in item difficulty. Conclusions: Item-response-theory methods can be productively used to analyze and quantify anomia severity in aphasia. Regression of item difficulty on lexical variables supported the validity of the PNT and interpretation of anomia severity scores in the context of current word-finding models.
File Format	HTM / HTML
ISSN	10924388
Issue Number	3
Journal	Journal of Speech Language and Hearing Research
Volume Number	58
e-ISSN	15589102
Language	English
Publisher	American Speech-Language-Hearing Association
Publisher Date	2015-06-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Audiology
Content Type	Text
Resource Type	Article
Subject	Medicine Speech and Hearing Linguistics and Language

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