Journal
NEUROPSYCHOLOGY
Volume 19, Issue 3, Pages 318-331Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/0894-4105.19.3.318
Keywords
single-case studies; statistical methods; dissociations
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In neuropsychological single-case studies, a patient is compared with a small control sample. Methods of testing for a deficit on Task X, or a significant difference between Tasks X and Y, either treat the control sample statistics as parameters (using z and z(D)) or use modified t tests. Monte Carlo simulations demonstrated that if z is used to test for a deficit, the Type I error rate is high for small control samples, whereas control of the error rate is essentially perfect for a modified t test. Simulations on tests for differences revealed that error rates were very high for z(D). A new method of testing for a difference (the revised standardized difference test) achieved good control of the error rate, even with very small sample sizes. A computer program that implements this new test (and applies criteria to test for classical and strong dissociations) is made available.
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