A meta-analysis of Wechsler scale data on 9,372 LD children failed to distinguish these children from their normal peers on any of the ability patterns that have conventionally been held to characterize LD children's test performance. However, a reanalysis of their data using a learning disability index (LDI), derived from a principal-components analysis of the WISC-R, was found to discriminate reliably between the two groups of children.
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References
1.
BellemareF.G.InglisJ.LawsonJ.S. (1986). Learning disability indices derived from a principal components analysis of the WISC-R: A study of learning disabled and normal boys. Canadian Journal of Behavioural Science, 18, 86–91.
2.
InglisJ.LawsonJ.S. (1985). The cross-cultural validity of the learning disability index: A reanalysis of Mishra's data. Journal of Clinical Psychology, 41, 680–685.
3.
KavaleK.A.FornessS.R. (1984). A meta-analysis of Wechsler scale profiles and recategorizations: Patterns or parodies?Learning Disability Quarterly, 7, 136–156.
4.
LawsonJ.S.InglisJ. (1984). The psychometric assessment of children with learning disabilities: An index derived from a principal components analysis of the WISC-R. Journal of Learning Disabilities, 17, 517–522.
5.
LawsonJ.S.InglisJ. (1985). Learning disabilities and intelligence test results: A model based on a principal components analysis of the WISC-R. British Journal of Psychology, 76, 35–48.
6.
LawsonJ.S.InglisJ.StroudT.W.F. (1983). A laterality index of cognitive impairment derived from a principal components analysis of the WAIS-R. Journal of Consulting and Clinical Psychology, 51, 841–847.
7.
RugelR.P. (1974). WISC subtest scores of disabled readers: A review with respect to Bannatyne's recategorization. Journal of Learning Disabilities, 7, 57–64.
8.
TittemoreJ.A.LawsonJ.S.InglisJ. (1985). Validation of a learning disability index (LDI) derived from a principal components analysis of the WISC-R. Journal of Learning Disabilities, 18, 449–454.
9.
TittemoreJ.A.LawsonJ.S.InglisJ. (1987). A learning disability index (LDI) derived from the WISC-R: Age differences in referred children. Journal of Child Psychology and Psychiatry, 28, 173–180.
10.
WechslerD. (1949). Manual for the Wechsler intelligence scale for children. New York: Psychological Corporation.
11.
WechslerD. (1967). Manual for the Wechsler preschool and primary scale of intelligence. New York: Psychological Corporation.
12.
WechslerD. (1974). Manual for the Wechsler intelligence scale for children - Revised. New York: Psychological Corporation.
