How to Report the Results of a Repeated Measures ANOVA


A repeated measures ANOVA is used to determine whether or not there is a statistically significant difference between the means of three or more groups in which the same subjects show up in each group..

When reporting the results of a repeated measures ANOVA, we always use the following general structure:

  • A brief description of the independent and dependent variable.
  • The overall F-value of the ANOVA and the corresponding p-value.

Here’s the exact wording we can use:

A repeated measures ANOVA was performed to compare the effect of [independent variable] on [dependent variable].

 

There [was or was not] a statistically significant difference in [dependent variable] between at least two groups (F(between groups df, within groups df) = [F-value], p = [p-value]).

The following example shows how to report the results of a repeated measures ANOVA in practice.

Example: Reporting Results of a Repeated Measures ANOVA

Researchers want to know if four different drugs lead to different reaction times. To test this, they measure the reaction time of five patients on the four different drugs.

Since each patient is measured on each of the four drugs, they use a repeated measures ANOVA to determine if the mean reaction time differs between drugs.

The following table shows the results of the repeated measures ANOVA:

Here is how to report the results:

A repeated measures ANOVA was performed to compare the effect of a certain drug on reaction time.

 

There was a statistically significant difference in reaction time between at least two groups (F(4, 3) = 18.106, p < .000).

Things to Keep in Mind

Here are a few things to keep in mind when reporting the results of a repeated measures ANOVA:

Use a descriptive statistics table.

It can be helpful to present a descriptive statistics table that shows the mean and standard deviation of values in each treatment group as well to give the reader a more complete picture of the data.

Round p-values when necessary.

As a general rule of thumb, you should round the values for the overall F value and any p-values to either two or three decimal places for brevity.

No matter how many decimal places you use, be sure to be consistent throughout the report.

Additional Resources

The following tutorials explain how to report other statistical tests and procedures in APA format:

How to Report Two-Way ANOVA Results (With Examples)
How to Report Cronbach’s Alpha (With Examples)
How to Report t-Test Results (With Examples)
How to Report Chi-Square Results (With Examples)
How to Report Pearson’s Correlation (With Examples)
How to Report Regression Results (With Examples)

Leave a Reply

Your email address will not be published.