PSY 2103 Chapter : Withdraw.docx

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Atd operation and logic: experimental control is determined by the visual inspection of the data paths, when the data paths of the two interventions show no overlap with one another and either stable levels or opposing trends, experimental control exists, when some overlap in data paths occur, a degree of experimental control can be demonstrated if a majority of data points for a given intervention fall outside the range of values of the majority of data points in the other condition, experimental control is confirmed by the vertical distance between respective data paths. Advantages of the atd: minimizes sequence effects, difficult to control in the reversal design, rapid alternation minimizes possibility of sequence effects, does not require withdrawal of treatment, allows quick comparison of two or more treatments. Advantages of the atd: minimizes problem of irreversibility, rapid alternation, can be used with unstable data, as long data paths are visually different, experimental control is demonstrated, does not require a baseline.

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