Advantages of the posttest-only control group design
- The treatment and control groups are equivalent at baseline. ...
- External factors are controlled. ...
- Can be used when participants' anonymity must be kept. ...
- Not affected by reactions to pretesting. ...
- Can be done when a pretest is not possible.
Under what circumstances would I use a posttest only experimental design?
When might you use the posttest-only design? The advantage would be that without a pretest you wouldn't be taking as much time. The disadvantage would be the useful-side of the pretest where you can see changes as well as attrition effects.
What is a posttest only design?
The posttest-only control group design is a research design in which there are at least two groups, one of which does not receive a treatment or intervention, and data are collected on the outcome measure after the treatment or intervention.
