Hi fellows, can any one guide me about this research design, and its threats please.
If someone have applied it in his/her research, I shall be thankful to your if your provide me details.
Hello Amjad,
The "ABA" design is one of the simplest of single-subject design approaches. In a nutshell:
One obtains sufficient repeated observations to establish a stable baseline of some target outcome (this is the "A" or baseline phase).
Next, one introduces a treatment, and collects sufficient additional, repeated observations to establish whatever trend or change might emerge, ostensibly due to the addition of the treatment (this is the "B" phase).
Finally, one withdraws the treatment, and collects sufficient additional, repeated observations to establish whether the target outcome is influenced by the removal of the treatment (so, this is a repeat of the "A" or baseline, or non-treatment, phase).
There are plenty of good resources available on the web, and numerous videos in youtube on single-subject design strategies, as Professor Booth's post would indicate.
Good luck with your work.
Addendum: There is also a general approach to intervention in behavioral sciences called Applied Behavior Analysis (ABA). If that is what you're referring to, then it would subsume single-subject methods along with principles of reinforcement (both positive and negative), punishment, chaining, reinforcement schedules, and a host of related concepts.
Dear Dr Amjad Islam Amjad
ABA designs are experimental designs that allow for causal conclusions, and the data generated by such designs add to our understanding of evidence-based treatments in the behavioral sciences. The ABA design's emphasis on individual behavior is a defining feature.
The reversal design, also known as the ABA design, is the most fundamental single-subject research design. The dependent variable's baseline is set during the first phase, A. The baseline phase is a form of control condition since it represents the degree of responding before any therapy is administered.
Best Regards
Dr. Fatemeh Khozaei
An ABA design is a type of withdrawal design. It is a single subject research design. Threats to external validity include generalizability of results to others. They have the advantage of high internal validity.
The field of ABA (applied behavior analysis) uses a lot of single subject designs. I’m not sure if that is what you meant or not.
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