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Stability of Rasch Scales over Time
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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
Use of Restricted Item Response Theory Models for Examining the Stability of Item Parameter Estimates over Time.
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Stone, Clement A.; Lane, Suzanne – Applied Measurement in Education, 1991
A model-testing approach for evaluating the stability of item response theory item parameter estimates (IPEs) in a pretest-posttest design is illustrated. Nineteen items from the Head Start Measures Battery were used. A moderately high degree of stability in the IPEs for 5,510 children assessed on 2 occasions was found. (TJH)
Descriptors: Comparative Testing, Compensatory Education, Computer Assisted Testing, Early Childhood Education
Applications of Latent Class Modeling to Investigate the Structure Underlying Reading Comprehension Items.
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Davey, Beth; Macready, George B. – Applied Measurement in Education, 1990
The usefulness of latent class modeling in addressing several measurement issues is demonstrated via a study of 74 good and 74 poor readers in grades 5 and 6. Procedures were particularly useful for assessing the hierarchical relation among skills and for exploring issues related to item domains. (SLD)
Descriptors: Comparative Testing, Elementary School Students, Grade 5, Grade 6