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ERIC Number: ED516812
Record Type: Non-Journal
Publication Date: 2010
Pages: 97
Abstractor: As Provided
ISBN: ISBN-978-1-1097-3974-9
Long-Term Stability of Scores on the Wechsler Intelligence Scale for Children-Fourth Edition in Children with Learning Disabilities
Lander, Jenny
ProQuest LLC, Psy.D. Dissertation, Fairleigh Dickinson University
The present investigation explored the stability of scores on the Wechsler Intelligence Scale for Children-IV (WISC-IV) over approximately a three-year period. Previous research has suggested that some children with Learning Disabilities (LD) do not demonstrate long-term stability of intelligence. Legally, school districts are no longer required to administer a cognitive test every three years for students classified in special education. Given that research has not been conducted investigating long-term stability of intelligence utilizing the Wechsler Intelligence Scale for Children-IV (WISC-IV), the present study was necessary. The 131 participants were selected utilizing archival WISC-W data from a suburban school district. Twenty of the participants were not originally classified with LD, but following the retest, all participants were classified with LD. Test-retest stability was examined using correlation coefficients and "t"-tests. For the LD sample, correlations for the index scores ranged from 0.65 (Verbal Comprehension Index [VCI]) to 0.52 (Processing Speed Index [PSI]). Full Scale IQ demonstrated the highest correlation of 0.70. Subtest correlations ranged from 0.62 (Block Design) to 0.28 (Symbol Search). "T"-test analyses revealed that all composite and index scores were constant over time, except for PSI, but the difference in scores was found to be small. Differences were found among certain subtests, but effect sizes were also considered small for all subtests. Analyses of individual scores indicated that the majority of individuals demonstrated a change of scores within [plus or minus]2 Standard Error of Measurement units (SEM) on all composite/index scores. However, more variability was noted than might be anticipated from the general population, as 19% to 30% of the students changed at or above [plus or minus]3 SEM on all composite/index scores. Implications and suggestions for future research are reviewed. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page:]
ProQuest LLC. 789 East Eisenhower Parkway, P.O. Box 1346, Ann Arbor, MI 48106. Tel: 800-521-0600; Web site:
Publication Type: Dissertations/Theses - Doctoral Dissertations
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Wechsler Intelligence Scale for Children