Section author: Jonas Rafi

ANOVA: Repeated Measures

How to perform a repeated measures ANOVA in jamovi:
  1. You need one continuous continuous outcome variable for each measurement occasion.
    A correct setup should look similar to this:


  2. Select AnalysesANOVARepeated Measures ANOVA.


  3. In the box Repeated Measures Factors: write the name of your outcome variable (e.g. My_scale) and name the levels for each measurement occasion (e.g. Pre, Post and 12 month follow-up). The images below shows the box with default values (left) and when the values has been set (right).

    add_var_anova_repeated_naming_1 add_var_anova_repeated_naming_2

  4. Drag and drop your outcome variables to their respective cells in Repeated Measures Cells.


  5. To test the equality of the variance with the Levene test, open the Assumption Checks drop-down menu and set the Homogeneity test tick box. It is also a good idea to check that the variances at the different steps of the repetition factor are the same (Sphericity). To do so, open the Assumption Checks drop-down menu and set the Sphericity tests tick box.

  6. The results are shown in the right panel:


Further help from the community resources

A more comprehensive introduction into this statistical method is provided by this video by Barton Poulson.
For those, aiming to stretch even further to an in-depth introduction, you can read the respective section in the “Learning statistics with jamovi” web documentation or chapter 13.7 of the e-book by Danielle J. Navarro and David R. Foxcroft.