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Discrepancy Score Reliabilities in the WISC-IV Standardization Sample

University of Central Missouri

Joseph J. Ryan

University of Central Missouri, ryan{at}ucmo.edu

Richard A. Charter

Department of Veterans Affairs Medical Center, Long Beach, CA

Jared M. Bartels

University of Central Missouri

This investigation provides internal consistency reliabilities for Wechsler Intelligence Scale for Children—Fourth Edition (WISC-IV) subtest and index discrepancy scores using the standardization sample as the data source. Reliabilities range from .50 to .82 for subtest discrepancy scores and from .78 to .88 for index discrepancy scores. Thus, the reliabilities of the WISC-IV subtest and index discrepancy scores do not reach the .90 criterion recommended for clinical decision making. However, 5 of the 66 subtest and 33 of the 36 index discrepancy score reliabilities are .80, which is regarded as adequate when hypothesis generation is the goal instead of decision making.

Key Words: WISC-IV • discrepancy scores • reliability • confidence intervals

This version was published on April 1, 2009

Journal of Psychoeducational Assessment, Vol. 27, No. 2, 138-144 (2009)
DOI: 10.1177/0734282908325158


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