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Journal of Learning Disabilities
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Concerns in Interpreting Subtest Scatter on the Tests of Cognitive Ability from the Woodcock-Johnson Psycho-Educational Battery

Doug Marston, PhD

Douglas Marston is a post-doctoral associate in the Institute for Research on Learning Disabilities. University of Minnesota. He received his PhD in special education from the University of Minnesota.

James Ysseldyke, PhD

James Ysseldyke is director of the Institute for Research on Learning Disabilities. University of Minnesota. He received his PhD in educational psychology from the University of Illinois. Address: Dr. James Ysseldyke. 350 Elliott Hall. 75 East River Road. Minneapolis. Minnesota 55455.

An analysis of scatter among the Tests of Cognitive Ability for the Woodcock-Johnson Psycho-Educational Battery was conducted on the performance of subjects in grades 1 through 12 from the standardization sample. Large mean high subtest-low subtest differences were noted for each grade level and compared to WISC-R scaled score ranges. Frequency distributions for high-low differences are presented as well as the mean differences between all pair-wise combinations for the 12 subtests. The practice of examining scatter on the Tests of Cognitive Ability, and especially efforts to identify specific "types" of learning disabled students using this test, are discouraged.

Journal of Learning Disabilities, Vol. 17, No. 10, 588-591 (1984)
DOI: 10.1177/002221948401701004
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