PSYB01H3 Chapter Notes - Chapter 11: Interrupted Time Series, Longitudinal Study, Time Series
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Effect of independent variable must inferred from experiment with only one participant . Need to determine whether experimental manipulation had effect on single participant : subject"s behavior is measured over time during baseline control periods . Baseline: subjects behavior during control period before introduction of experimental manipulation : manipulation is introduced during treatment period , behavior of subjects is continues to be observed . Change in behavior from baseline to treatment period is evidence for manipulation effectiveness . Have issue in how to determine that the manipulation of independent variable had an effect . By reversing manipulation in reversal design . Reversal design: demonstrate reversibility of manipulation to show effect in how it"s effect in variable. Known as aba design, or withdrawal design . Requires behavior be observed during baseline control period and again during treatment period . And also during second baseline period after experimental treatment has removed . Design can be improved by extending to abab design .
