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      Investigation of the single case in neuropsychology: confidence limits on the abnormality of test scores and test score differences.

      1 ,
      Neuropsychologia
      Elsevier BV

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          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.

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          Author and article information

          Journal
          Neuropsychologia
          Neuropsychologia
          Elsevier BV
          0028-3932
          0028-3932
          2002
          : 40
          : 8
          Affiliations
          [1 ] Department of Psychology, King's College, University of Aberdeen, UK. j.crawford@abdn.ac.uk
          Article
          S002839320100224X
          10.1016/s0028-3932(01)00224-x
          11931923
          10d2490e-0dea-41ec-a1f7-8df82301d83e
          History

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