Section author: Jonas Rafi

ANOVA: Mixed

How to perform a mixed ANOVA in jamovi:
  1. You need one continuous continuous variable for each within-subject measurement (e.g. pre / post), at least one nominal grouping variable with at least two levels (e.g. treatment / control) and one nominal variable to function as a between subject factor (e.g. gender).
    A correct setup should look similar to this:

    data_format_anova_mixed


  2. Select Analyses → ANOVA → Repeated Measures ANOVA.

    select_anova_repeated


  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 illustrates this.

    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.

    add_var_anova_repeated


  5. Move your grouping variable(s) to Between Subject Factors.

    add_var_anova_mixed


  6. The result is shown in the right panel:

    output_anova_mixed


  7. A little more comprehensive introduction into this statistical method is provided by this video.