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Research Report The Statistical Analysis of Single-Subject Data: A Comparative Examination Background and Purpose. The p

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Research Report

The Statistical Analysis of Single-Subject Data: A Comparative Examination

Background and Purpose. The purposes of this study were to examine whether the use of three dzfferent statistical methodsfor analyzing single-subject data led to similar results and to identtfi components of graphed data that influence agreement (or disagreement) among the statistical procedures. Metbocls. Forty-twographs containing single-subject data were examined. Twenty-onewere AB charts of hypothetical data. The other 21 graphs appeared in Journal of Applied Behavioral Analysis, Physical Therapy, Journal of the Association for Persons With Severe Handicaps, and Journal of Behavior Therapy and Experimental Psychiatry. Three dzfferent statistical tests-the C statistic, the two-standard deviation band method, and the split-middle method of trend estimation-were used to analyze the 42 graphs. Results. A relatively low degree of agreement (38%) was found among the three statistical tests. The highest rate of agreementfor any two statistical procedures (71%) wasfound for the two-standard deviation band method and the C statistic. A logistic regression analysis revealed that overlap in single-subject graphed data was the best predictor of disagreement among the three statistical tests (P =.49, P