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Estimating IQ from Adaptive Behaviour Information in People with Moderate or Severe Intellectual Disability
Author(s) -
Moss Steve,
Hogg James
Publication year - 1997
Publication title -
journal of applied research in intellectual disabilities
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.056
H-Index - 63
eISSN - 1468-3148
pISSN - 1360-2322
DOI - 10.1111/j.1468-3148.1997.tb00007.x
Subject(s) - intellectual disability , intelligence quotient , psychology , intellectual ability , adaptive behaviour , divergence (linguistics) , sample (material) , computerized adaptive testing , developmental psychology , psychometrics , cognition , psychiatry , linguistics , philosophy , chemistry , chromatography
It is often useful in studies of intellectual disability to be able to stratify the sample in terms of intellectual level. However, this information is sometimes difficult to obtain, and can involve a great deal of time if full IQ assessments are performed. This study explores the accuracy with which IQ scores can be projected by multiple regression from adaptive behaviour scores provided by informants. Fifty‐one people with moderate, severe or profound intellectual disability received IQ assessments using the Kaufman Assessment Battery, and adaptive behaviour assessments using the Adaptive Behavior Scales (ABS). Ninety percent of projected estimates differed by less than 30% from that estimated by the K‐ABC. Mean percentage divergence between actual and predicted estimates of IQ for the 51 cases for which all data were available was 15.0%. Limitations of the technique are discussed. The actual coefficients for calculating IQ are given in tabular form.