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Educational and Psychological Measurement
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Technical Analysis of the Slosson–Diagnostic Math Screener (S-DMS)

Bradley T. Erford

Loyola College in Maryland, berford{at}loyola.edu

Lauren Klein

Loyola College in Maryland

The Slosson-Diagnostic Math Screener (S-DMS) was designed to help identify students in Grades 1 to 8 at risk for mathematics failure. Internal consistency, test-retest reliability, item analysis, decision efficiency, convergent validity, and factorial validity of all five levels of the S-DMS were studied using 20 independent samples of students aged 6 to 13 years. The Woodcock-Johnson Tests of Achievement-Revised Broad Mathematics Cluster, the Wide Range Achievement Test-Revised Arithmetic subtest, and the KeyMath-Revised Operations Area were used as convergent validity measures.

Key Words: mathematics • factorial validity • decision efficiency • reliability • convergent validity

Educational and Psychological Measurement, Vol. 67, No. 1, 132-153 (2007)
DOI: 10.1177/0013164406292035
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