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Wise, Lauress L. – Applied Measurement in Education, 2010
The articles in this special issue make two important contributions to our understanding of the impact of accommodations on test score validity. First, they illustrate a variety of methods for collection and rigorous analyses of empirical data that can supplant expert judgment of the impact of accommodations. These methods range from internal…
Descriptors: Reading Achievement, Educational Assessment, Test Reliability, Learning Disabilities
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Taylor, Catherine S.; Lee, Yoonsun – Applied Measurement in Education, 2010
Item response theory (IRT) methods are generally used to create score scales for large-scale tests. Research has shown that IRT scales are stable across groups and over time. Most studies have focused on items that are dichotomously scored. Now Rasch and other IRT models are used to create scales for tests that include polytomously scored items.…
Descriptors: Measures (Individuals), Item Response Theory, Robustness (Statistics), Item Analysis