Single-Case Research

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  • Research that investigates the effect of an experimental treatment on one or a few research participants (Johnson & Christensen, 2008). It is frequently used in clinical settings where the goal is to evaluate a treatment for a particular individual rather than to determine the average effect for a population. There are several popular designs in single-case research. First is the A-B-A-B design, in which the letter A stands for baseline or nontreatment period, and B stands for treat ment period. Multiple measurements of the outcome variable are taken within each period. Efficacy of the treatment is indicated by a high-low-high-low pattern (or a low-high-low-high pattern) of behavior (i.e., the behavior changes each time the treatment is adminis tered, and it reverts to baseline when the ...

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