PSYB01H3 Chapter 12: Chapter 12
Mixed Design
Which Therapy is Best for Treating Eating
Disorders?
Introduction to Our Research Question
● How do treatment types and emotional triggers impact anorexia nervosa?
● since, we don’t know much about this topic it’s best to find a research article
that includes meta analysis
● meta-analysis
○ a statistical strategy for comparing and integrating the results from
multiple studies on the same research question to summarize what
they say collectively on that topic.
■ It might be nice for us to find a research article with a meta-
analysis on the therapeutic treatment of anorexia nervosa to
help us decide which type of treatment to explore in our
research.
Picking a Design
- our research question is clearly cause and effect → therefore experimental
design
Single Subject Design
● single subject design ( single- case design or single-n design)
○ special type of within-subjects design using one subject (human or
animal) or perhaps a single group to assess changes within that
individual or group.
● A-B design
○ to establish a cause-and- effect relationship, the researcher takes a
baseline measure before intervention, noted as the A phase of the
study,
■ and then introduces an intervention or experimental treatment,
known as the B phase.
○ Afterward, researchers measure the same variable again with the
same participant, hence the within-subjects nature
● A-B-A design
○ researchers establish a baseline, introduce the intervention and
measure the same variable again, then remove the intervention and
take another measurement.
○ This helps to establish covariation by showing that behavior
systematically changes as researchers introduce and remove the
treatment.
● A-B-A-B- design
○ researcher takes a measurement before exposure to treatment (A),
after exposure to treatment (B), after the treatment has been removed
(A), and again after the treatment has been reinstituted (B).
○ they do this to get even more proof of causality
● DISADVANTAGES FOR SINGLE-SUBJECT DESIGN
○ there is no control group!
■ limit our ability to establish cause and effect
○ external validity!
■ With this type of design, it is hard to rule out whether the single
subject or group in our study is representative of the population
at large
Mixed Design
● Mixed Design
○ an experimental design that combines within-subjects and between-
subjects methods of data collection.
Document Summary
Since, we don"t know much about this topic it"s best to find a research article that includes meta analysis. A statistical strategy for comparing and integrating the results from multiple studies on the same research question to summarize what they say collectively on that topic. It might be nice for us to find a research article with a meta- analysis on the therapeutic treatment of anorexia nervosa to help us decide which type of treatment to explore in our research. Our research question is clearly cause and effect therefore experimental design. Single subject design ( single- case design or single-n design) Special type of within-subjects design using one subject (human or animal) or perhaps a single group to assess changes within that individual or group. A-b design to establish a cause-and- effect relationship, the researcher takes a baseline measure before intervention, noted as the a phase of the study,
