An evaluation of the sensitivity of premorbid IQ estimators for detecting cognitive decline
Article Abstract:
Psychologists may need to measure cognitive decline to assess the impact of a head injury, or dementia. A review of 22 studies was carried out with estimates of IQs, using ability estimators like the National Adult Reading test, or demographic regression equation estimators. Psychometric theory was used to quantify the potential usefulness of these methods in assessing cognitive decline. Demographic predictor methods would pick up a decline of 25 points or more of the Weschler Adult Intelligence Scale, while reading test predictor assessment were sensitive above 20 points. The sensitivity of these methods is limited, and many applications need more sensitive methods, though these methods can be useful.
Publication Name: Psychological Assessment
Subject: Psychology and mental health
ISSN: 1040-3590
Year: 1999
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The bias in regression-based indices of premorbid IQ
Article Abstract:
The article critiques the use of regression-based estimations of premorbid intelligence to calculate the extent of damage to the intellect after a traumatic brain injury. Specific precautions are given for using regression analysis depending on whether the intelligence quotient is above or below 100.
Publication Name: Psychological Assessment
Subject: Psychology and mental health
ISSN: 1040-3590
Year: 2001
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Biased estimators, biased experts, and the ivory tower: a reply to Grove (2001)
Article Abstract:
The authors defend their recommendation of regression estimates of premorbid intelligence quotient, demonstrating that the method is both unbiased and produces the maximum-likelihood IQ estimate.
Publication Name: Psychological Assessment
Subject: Psychology and mental health
ISSN: 1040-3590
Year: 2001
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