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A Comparison of Winsteps and Bilog-MG for Vertical Scaling with the Rasch Model
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Pomplun, Mark; Omar, Hafidz; Custer, Michael – Educational and Psychological Measurement, 2004
The present study compares vertical scaling results for the Rasch model from BILOG-MG and WINSTEPS. The item and ability parameters for the real and simulated mathematics tests were scaled across five grades, second to sixth. The simulated data were based on real data for a series of mathematics tests for Grades 2 to 6. The results from WINSTEPS…
Descriptors: Elementary Education, Scaling, Mathematics Tests, Item Response Theory
The Differential Predictive Validity of the Initial Skills Analysis: Reading Screening Tests for K-3
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Pomplun, Mark – Educational and Psychological Measurement, 2004
The present study investigated the differential predictive validity of the Initial Skills Analysis. In the fall, these reading screening tests were administered to students in Grades K to 3. In the spring, a series of reading outcomes tests were administered to these same students, and teachers provided judgments of the students' reading skills.…
Descriptors: Skill Analysis, Prediction, Minority Groups, Reading Skills