4 ANOVA

This chapter shows how to conduct an ANOVA (4.1) and its extensions factorial ANOVA (4.2), repeated measures ANOVA (4.3), and mixed ANOVA (4.4).

4.1 ANOVA

How to perform an ANOVA in jamovi:
  1. Check that your data contains a grouping variable and a continuous outcome variable. Your data should look something like this:

  2. Select Analyses -> ANOVA -> ANOVA.

  3. Move your outcome variable to Dependent Variable and your grouping variable to Fixed Factors.

  4. The results is shown in the right pane:

4.2 Factorial ANOVA

How to perform a factorial ANOVA in jamovi:
  1. Check that your data contains two grouping variables and a continuous outcome variable. Your data should look something like this:

  2. Select Analyses -> ANOVA -> ANOVA.

  3. Move your outcome variable to Dependent Variable and your grouping variables to Fixed Factors.

  4. The result is shown in the right pane:

4.3 Repeated measures ANOVA

How to perform a repeated measures ANOVA in jamovi:
  1. Check that your data contains a continuous outcome variable and that the data format is wide. Your data should look something like 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 images below shows the box with default values (left) and when the values has been set (right).
    ->

  4. Move your outcome variables to their respective cells in Repeated Measures Cells.

  5. The results are shown in the right pane:

4.4 Mixed ANOVA

How to perform a mixed ANOVA in jamovi:
  1. You need one grouping variable and a continuous outcome variable. Also, the data should be in the wide data format. Your data should look something like 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. Move 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: