Assignment task:
ABAB Designs: Basic Characteristics
Design Variations:
Describe three ways that an investigator can vary what can be done in the second "A" phase.
Describe some of the conditions where the design might begin with the intervention, using a BABA design.
Describe how increasing the number of phases in an ABAB design can reduce threats to internal validity
Number of Different Interventions:
ABAB designs can vary in the number of different _______________ they include. Occasionally, investigators may include _______________ _______________ (B and C phases) in the same design.
Why might an investigator use more than one intervention in the same design?
Describe order effects and sequence effects. Now describe two solutions to the problems of comparing two or more interventions.