Differential Ability Scales (DAS-II)
The Differential Ability Scales (DAS-II) were developed as an evaluation tool for the cognitive ability and achievement of children. Psychologists depend on the DAS-II to provide insight into the manner in which a child processes information, giving solutions to fix learning problems.
For testing, the participants from the ages of 2-6 or 11-1 years must respond to 63 multiple-choice items. There are four different forms for the test: Preschool, School-Age, Cognitive Battery, School Achievement. Approximately 45-60 minutes is required for completion.
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Colin D. Elliott
Reliability and Validity
Reliability coefficient for the DAS are all reported very high – average 0.90 to 0.94 for Preschool Level and 0.95 for School Age Level. A score of 0.79 to 0.94 is associated with the test-reliability, also very high. The DAS scale has been correlated with the McCarthy Scales of Children’s Ability (MSCA) showing the highest ratings with the Verbal, Perceptual-Performance, or Qualitative scales in the DAS. In addition, the WISC-R Full Scale IQ correlated highly with all the school age level subtests, specifically with the Verbal ability cluster. The SB-IV also showed strong correlation for ages of 9 to 10.
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Administration, Analysis and Reporting
Statistics Solutions consists of a team of professional methodologists and statisticians that can assist the student or professional researcher in administering the survey instrument, collecting the data, conducting the analyses and explaining the results.
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References
Braden, J. P. (1992). The Differential Ability Scales and special education. Journal of Psychoeducational Assessment, 10, 92-98.
Elliott, C. D. (1990). Differential Ability Scales. San Antonio, TX: The Psychological Corporatation.
Elliott, C. D. (1990). The nature and structure of children’s abilities: Evidence from the Differential Ability Scales. Journal of Psychoeducational Assessment, 8, 376-390.
Elliott, C. D. (1990). Differential Ability Scales. Introductory and technical handbook. San Antonio, TX: The Psychological Corporation. View
Dissertations and Journals
McIntosh, D.E. & Gridley, B. E.(1993). Differential Ability Scales: Profiles of Learning-Disabled Subtypes. Psychology in the Schools, 30 (1), 11-24.
Elliott, C. D. (1990). The nature and structure of children’s abilities: Evidence from the Differential Ability Scales. Journal of Psychoeducational Assessment, 8(3), 376-390.