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11 - Single Subject Design Often used in clinical trials...

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10/24/11 Single Subject Design Often used in clinical trials Methods doctors often use with patients although not often published experiments Switch to a different medication if one has no effect Adjust medication level if tolerance develops Differing assumptions Single subjects tradition o Individual subjects are essentially equivalent o Most variability in the subjects behavior is imposed by the situation (external influences) o Variability can be removed by careful attention to experimental control Individual differences tradition (much more common and prevalent) o Most of the variability is the subjects behavior is intrinsic and inevitable (internal influences) o Variability should be statistically controlled Advantages to the Single Subject Design Focuses only on individual performance Focuses on Big Effect Power o The probability that a statistical test will find a sig. dif. When there
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