Beyond Full Scale IQ: A New WAIS-III Indicator of Mental Retardation
نویسنده
چکیده
It is paradoxical that individuals with mental retardation are disproportionately represented in the criminal justice system, suggesting a greater proportion of false positives, while at the same time there is concern regarding a potential motivation for individuals without mental retardation to simulate such a condition for the purpose of avoiding the death penalty, a concern for false negatives. To determine if the likelihood of accurate classification of impairment could be enhanced, we examined the pattern of scaled scores in the WAIS-III standardization dataset. Specifically, we compared the scores obtained by individuals obtaining a Full Scale IQ within the Borderline range with those in the Mild or Moderate range of impairment. Difference scores among the indexes were used to create a composite indicator making it possible to more than double the likelihood of correctly detecting impairment. Given the potential motivation to simulate impairment, a unique feature of the composite indicator described here is the inclusion of a regression equation to estimate missing values.
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