In a repeated-measures design, the same subjects are used in both treatment conditions . In a matched-subjects design, two different sets of subjects are used.
What is the main advantage of a repeated measures design?
More statistical power: Repeated measures designs can be very powerful because they control for factors that cause variability between subjects . Fewer subjects: Thanks to the greater statistical power, a repeated measures design can use fewer subjects to detect a desired effect size.
What is the difference between a repeated measures study and a matched pairs study?
Repeated measures /within-groups: The same participants take part in each condition of the independent variable. 3. Matched pairs: Each condition uses different participants, but they are matched in terms of important characteristics, e.g., gender, age, intelligence, etc.
What is a repeated measures design example?
In a repeated measures design, each group member in an experiment is tested for multiple conditions over time or under different conditions . For example, a group of people with Type II diabetes might be given medications to see if it helps control their disease, and then they might be given nutritional counseling.
What are the major advantages of using a repeated measures design compared to an independent design?
Advantages and Disadvantages
The primary strengths of the repeated measures design is that it makes an experiment more efficient and helps keep the variability low . This helps to keep the validity of the results higher, while still allowing for smaller than usual subject groups.
What are the 3 types of experimental design?
- Pre-experimental research design.
- True experimental research design.
- Quasi-experimental research design.
What are the types of experimental design in statistics?
- Data for statistical studies are obtained by conducting either experiments or surveys. ...
- In an experimental study, variables of interest are identified. ...
- Three of the more widely used experimental designs are the completely randomized design, the randomized block design, and the factorial design.
What is a weakness of using a repeated measures design?
The biggest weakness of the repeated measures design is the order of conditions and how this may affect participant performance . A way of dealing with this is counterbalancing. This ensures that each condition is tested first and second in equal amounts.
When repeated measures are used which assumption is violated?
Unfortunately, repeated measures ANOVAs are particularly susceptible to violating the assumption of sphericity , which causes the test to become too liberal (i.e., leads to an increase in the Type I error rate; that is, the likelihood of detecting a statistically significant result when there isn’t one).
What is the major advantage of a within participants design?
Perhaps the most important advantage of within-subject designs is that they make it less likely that a real difference that exists between your conditions will stay undetected or be covered by random noise . Individual participants bring in to the test their own history, background knowledge, and context.
What do you call a repeated design?
Lesson Summary. Experiments using repeated measures design, sometimes also called within-subject design , make measurements using only one group of subjects, where tests on each subject are repeated more than once after different treatments.
What is a between design?
In a between-subjects design, or a between-groups design, every participant experiences only one condition , and you compare group differences between participants in various conditions. It’s the opposite of a within-subjects design, where every participant experiences every condition.
How many participants are needed for an independent measures design?
a. An independent-measures design would require two separate samples , each with 10 subjects, for a total of 20 subjects.
What is an example of an independent measures design?
An independent measures design is a research method in which multiple experimental groups are used and participants are only in one group. Each participant is only in one condition of the independent variable during the experiment. An example would be a drug trial for a new pharmaceutical .
What is the key difference between an independent groups design and a repeated measures design?
What is the difference between independent measures design and repeated measures design? An independent measures design consists of using different participants for each condition of the experiment. A repeated measures design consists of testing the same individuals on two or more conditions .
