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Calculating Achievement Composite Scores for Regression Discrepancy Models.
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Evans, Larry D. – Learning Disability Quarterly, 1996
This article provides the equations necessary to derive a single composite score based on two achievement scores measuring the same discrepancy area in students with learning disabilities. Also provided are the equations necessary to determine the composite score's reliability and its correlation with an IQ score. (CR)
Descriptors: Achievement Tests, Correlation, Elementary Secondary Education, Equations (Mathematics)