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Single Subject Research

Single Subject Research. Description of Design. Used with small number of subjects Establish cause-and-effect relationships Experimental Subject is measured, treated, measured ABA, ABAB reversal design. Repeated measurements on subjects over time / sessions

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Single Subject Research

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  1. Single Subject Research

  2. Description of Design • Used with small number of subjects • Establish cause-and-effect relationships • Experimental • Subject is measured, treated, measured • ABA, ABAB reversal design

  3. Repeated measurements on subjects over time / sessions • Results analyzed via intraocular analysis • No reliance upon traditional inferential statistics • Means and standard deviations

  4. Importance of results is consistency in behavior • Trying to establish patterns of behavior • Control over confounds

  5. Layout of Design • Phases-basic building block • Phase series of observations made under the same conditions • (A) Baseline Phase • (B) Treatment Phase (IV introduced) • (A) Baseline Phase (IV removed)

  6. Describing Behavior • “level” refers to the magnitude of the participant’s responses. • If all observations within a phase indicate approximately same magnitude or level of behindicative of stable/consistent behavior • “trend” refers to a consistent increase/decrease in magnitude of beh across sessions in a phase • Critical value is stability

  7. Parameters • Unstable data-first few observations might be reactivity • Average observations • Look for patterns within the inconsistency • Length of a phase-minimum of 3 sessions; min 5 to establish pattern • Phase Change- when pattern emerges • Introduce IV

  8. Visual Inspection • Subjective • Kazdin (2003) • Change in average level • Immediate change in level • Change in trend • Latency of change-large immediate change in pattern

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