HRS 610 Lecture Notes - Lecture 15: Random Assignment, Internal Validity

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Single subject designs: this design explores the effect of an iv (e. g. treatment) on a single participant, single subject designs have a baseline and treatment phase. It may be represented as an ab design. Single subject design: the ab design can be expanded to include more than one baseline phase or more than one baseline and more than one treatment phase. How would this be represented by a and b: because any expansion requires the withdrawal of the treatment during the second and subsequent baseline phases, the extensions of the ab design are called reversal or withdrawal designs. Multiple baseline designs: this is similar to the traditional single subject design, but it involves measuring the behavior multiple times before and after treatment implementation. Treatment may be applied sequentially across different behaviors of the same subject (multiple baseline across behaviors). Treatment may be applied sequentially across different settings for the same subject (multiple baseline across settings).

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