J.R. Crawford and Paul H. Garthwaite (2002) Investigation of the single case
in neuropsychology: confidence limits on the abnormality of test scores and
test score differences. Neuropsychologia, 40, 1196-1208
Abstract
Neuropsychologists often need to estimate the abnormality of an individual
patient's test score, or test score discrepancies, when the normative or
control sample against which the patient is compared is modest in size.
Crawford and Howell [The Clinical Neuropsychologist 12 (1998) 482] and
Crawford et al. [Journal of Clinical and Experimental Neuropsychology 20
(1998) 898] presented methods for obtaining point estimates of the
abnormality of test scores and test score discrepancies in this situation.
In the present study, we extend this work by developing methods of setting
confidence limits on the estimates of abnormality. Although these limits can
be used with data from normative or control samples of any size, they will
be most useful when the sample sizes are modest. We also develop a method
for obtaining point estimates and confidence limits on the abnormality of a
discrepancy between a patient's mean score on k-tests and a test entering
into that mean. Computer programs that implement the formulae for the
confidence limits (and point estimates) are described and made available.
_____________________________________________________________________
Paul Barrett DDI: +64-(0)9-262-6082
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