RESEARCH NOTE: A LEARNING DISABILITY INDEX (LDI) DERIVED FROM THE WISC‐R: AGE DIFFERENCES IN REFERRED CHILDREN

J. A. Tittemore · J. S. Lawson · James Inglis

8 citations0/0 files storedJournal of Child Psychology and Psychiatry

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Developmental and Educational Neuropsychology Psychological Testing and Assessment Cognitive Abilities and Testing

Abstract

A learning disability index (LDI) based on a principal components analysis of the WISC-R normative data has been developed to depict verbal or nonverbal deficits on that test. This index was calculated for the individual test performance of a total of 1371 children referred to a school-board psychology service because of educational difficulties. These children, categorised by sex and age, returned mean scores on this index that were reliably different from the scores of the normative population only after the age of 8 years in the case of the boys, and 7 years in the girls. This cross-sectional age effect was confirmed by longitudinal data obtained from the test-retest scores of a subset of these children.

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References

1974Manual for the Wechsler intelligence scale for children 1985Learning disabilities and intelligence test results: A model based on a principal components analysis of the WISC‐R 1985Validation of a Learning Disability Index (LDI) Derived from a Principal Components Analysis of the WISC-R 1984The Psychometric Assessment of Children with Learning Disabilities

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1988A Cross-Validation Study of Patterns of Cognitive Ability in Children with Learning Difficulties, as Described by Factorially Defined WISC-R Verbal and Performance IQs 2025Sex Differences in Intelligence on the WISC: A Meta-Analysis on Children with Specific Learning Disabilities 1989The relationship between achievement and IQ in students with learning disabilities 1990The predictive validity of the learning disabilities index (LDI): A six-year longitudinal study

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