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34-ANOVA-mixed.Rmd
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34-ANOVA-mixed.Rmd
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# ANOVA: Mixed {#mixed-anova}
#### 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 set^[This is demonstrated in section \@ref(level-of-measurement).] so that the grouping variable is marked with <img src="images/icons/nominal.JPG" width="3%" alt=" the grouped data icon"/> and the continuous variables are marked with <img src="images/icons/continuous.JPG" width="3%" alt=" the continuous data icon"/>.
A correct setup should look similar to this:
<img src="images/data_format/data_format_anova_mixed.JPG" width="50%"/>
2. Select `Analyses` -> `ANOVA` -> `Repeated Measures ANOVA`.
<img src="images/select/select_anova_repeated.JPG" width="40%"/>
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.
<img src="images/add_var/add_var_anova_repeated_naming_1.JPG" width="30%"/> `->` <img src="images/add_var/add_var_anova_repeated_naming_2.JPG" width="30%"/>
4. Drag and drop your outcome variables to their respective cells in __Repeated Measures Cells__.
<img src="images/add_var/add_var_anova_repeated.JPG" width="70%"/>
5. Move your grouping variables to __Between Subject Factors__.
<img src="images/add_var/add_var_anova_mixed.JPG" width="35%"/>
6. The result is shown in the right panel:
<img src="images/output/output_anova_mixed.JPG" width="70%"/>