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Direct linkFleming, Danielle; Wilson, Mark; Ahlgrim-Delzell, Lynn – Psychology in the Schools, 2018
The Nonverbal Literacy Assessment (NVLA) is a literacy assessment designed for students with significant intellectual disabilities. The 218-item test was initially examined using confirmatory factor analysis. This method showed that the test worked as expected, but the items loaded onto a single factor. This article uses item response theory to…
Descriptors: Item Response Theory, Severe Intellectual Disability, Factor Analysis, Nonverbal Ability
PDF pending restorationWilson, Mark; Wright, Benjamin D. – 1983
A common problem in practical educational research is that of perfect scores which result when latent trait models are used. A simple procedure for managing the perfect and zero response problem encountered in converting test scores into measures is presented. It allows the test user to chose among two or three reasonable finite representations of…
Descriptors: Factor Analysis, Item Analysis, Latent Trait Theory, Mathematical Models
