How to increase your chances of obtaining a significant association between handedness and disorder.
Handedness inventory data are peculiarly prone to be used to classify subjects in a post hoc fashion. Data from a computer simulation are used to show that if this procedure is adopted, significance levels can be seriously misleading: under certain conditions the odds of obtaining "significant" results by chance are as high as 2:3. Specification of cutoffs after inspection of the data is probably the most important source of spurious associations between handedness and disorder.
Bishop
D V
DV
Department of Psychology, University of Manchester, England.
D015982:Bias; D002648:Child; D003198:Computer Simulation; D002658:Developmental Disabilities / Q000523:psychology*; D004410:Dyslexia / Q000523:psychology; D007839:Functional Laterality; D006801:Humans; D009483:Neuropsychological Tests; D011594:Psychometrics; D012984:Software