10 ANOVA: Mixed

How to perform a mixed ANOVA in jamovi:

  1. You need one grouping variable with two levels (e.g. treatment/control) and one continuous outcome variable for each measurement occassion. Make sure that the measurement levels are set8 so that the grouping variable is marked with the grouped data icon and the continuous variables are marked with the continuous data icon.
    A correct setup should look similar to this:

  2. Select Analyses -> ANOVA -> Repeated 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 below images illustrates this.
    ->

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

  5. Move your grouping variables to Between Subject Factors.

  6. The result is shown in the right panel:

  1. This is demonstrated in section 2.↩