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Linking Outcomes From Peabody Picture Vocabulary Test Forms Using Item Response Models, Lesa Hoffman, Jonathan Templin, Mabel L. Rice
Linking Outcomes From Peabody Picture Vocabulary Test Forms Using Item Response Models, Lesa Hoffman, Jonathan Templin, Mabel L. Rice
Department of Psychology: Faculty Publications
Purpose: The present work describes how vocabulary ability as assessed by 3 different forms of the Peabody Picture Vocabulary Test (PPVT; Dunn & Dunn, 1997) can be placed on a common latent metric through item response theory (IRT) modeling, by which valid comparisons of ability between samples or over time can then be made.
Method: Responses from 2,625 cases in a longitudinal study of 697 persons for 459 unique PPVT items (175 items from Peabody Picture Vocabulary Test—Revised [PPVT–R] Form M [Dunn & Dunn, 1981], 201 items from Peabody Picture Vocabulary Test—3 [PPVT–3] Form A [Dunn & Dunn, 1997], and …