alternating treatments design
TRANSCRIPT
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Overview of Alternating Treatments
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Alternating Treatments Design
• Compares the effects of two or more treatments on the same behavior.
• Answers the question “Is one treatment more effective than another?”
• The purpose is to determine which condition is more effective in changing one behavior.
• Basic concept: When two or more treatments are alternated rapidly in time, you can evaluate the relative effects of the treatments.
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Alternating Treatments Design• Alternating treatments with no baseline
– Treatments are presented randomly to the subjects across different days, across times of day, or within sessions
– Pre-intervention baseline data are not collected.• Baseline followed by alternating treatments
– Baseline data are collected before the presentation of the treatments and provide additional information about changes from pre-treatment to treatment
• Baseline followed by alternating treatments and a final treatment phase– Ends in a final treatment phase that has been determined to be
the most effective during the study
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Examples of Alternating Treatments
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Examples of Alternating Treatments
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Alternating Treatments Design• Use when:– You want to determine the relative effectiveness
of more than one treatment on a given behavior– Baseline data are either unavailable or might be
unstable– Treatments are sufficiently different from each
other– Participants can discriminate the treatment
conditions
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Alternating Treatments Design• Disadvantages– No controls for extraneous variables are present.
You cannot make statements about absolute effects of treatment, only relative ones
– Not an appropriate design for behavior that is learned in stages.
– Should not be used when treatments need to be administered continuously to be effective