## Can you use ANOVA for repeated measures?

Introduction. Repeated measures ANOVA is the equivalent of the one-way ANOVA, but for related, not independent groups, and is the extension of the dependent t-test. A repeated measures ANOVA is also referred to as a within-subjects ANOVA or ANOVA for correlated samples.

## What is the purpose of repeated measures ANalysis of variance?

The benefits of repeated measures designs are that they reduce the error variance. This is because for these tests the within group variability is restricted to measuring differences between an individual’s responses between time points, not differences between individuals.

**What is a repeated measures ANalysis?**

Repeated-measure design is a research design in which subjects are measured two or more times on the dependent variable. Rather than using different participants for each level of treatment, the participants are given more than one treatment and are measured after each.

### What is a one-way repeated measures ANalysis of variance?

A one-way repeated measures ANOVA (also known as a within-subjects ANOVA) is used to determine whether three or more group means are different where the participants are the same in each group. For this reason, the groups are sometimes called “related” groups.

### Why is repeated measures ANOVA more powerful?

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 ANOVA to use?**

Use a two way ANOVA when you have one measurement variable (i.e. a quantitative variable) and two nominal variables. In other words, if your experiment has a quantitative outcome and you have two categorical explanatory variables, a two way ANOVA is appropriate.

## What is the difference between repeated measures and independent measures?

Independent measures / between-groups: Different participants are used in each condition of the independent variable. 2. Repeated measures /within-groups: The same participants take part in each condition of the independent variable.

## What are the advantages and disadvantages of repeated measures design?

2. Repeated Measures:

- Pro: As the same participants are used in each condition, participant variables (i.e., individual differences) are reduced.
- Con: There may be order effects.
- Pro: Fewer people are needed as they take part in all conditions (i.e. saves time).

**What is the advantage of a repeated measures research study?**

The main advantage of a repeated-measures study is that it uses exactly the same individuals in all treatment conditions. That, there is no risk that the participants in one condition are substantially different from the participants from another.