Question

What are two advantages to a repeated measures design? The repeated measures t test is most like which other t test that we have learned: single sample or independent samples t test? Why?

Answer 1

The two advantages to a repeated measures design:

1. More statistical power: Repeated measures designs can be very powerful because they control for factors that cause variability between subjects.

2.Fewer subjects: Thanks to the greater statistical power, a repeated measures design can use fewer subjects to detect a desired effect size. Further sample size reductions are possible because each subject is involved with multiple treatments. For example, if an independent groups design requires 20 subjects per experimental group, a repeated measures design may only require 20 total.

There are various methods The repeated measures t test is most like which other t test that we have learned independent samples t-test. Because we can use to reduce these problems in repeated measures designs. These methods include randomization, allowing time between treatments, and counterbalancing the order of treatments among others. Finally, it’s always good to remember that an independent groups design is an alternative for avoiding order effects.

Below is a very common crossover repeated measures design. Studies that use this type of design are as diverse as assessing different advertising campaigns, training programs, and pharmaceuticals. In this design, subjects are randomly assigned to the two groups and you can add additional treatments and a control group as needed.

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