# 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:

Check that your data contains a grouping variable and a continuous outcome variable. Your data should look something like this:

Select

`Analyses -> ANOVA -> ANOVA`

.

Move your outcome variable to

**Dependent Variable**and your grouping variable to**Fixed Factors**.

The results is shown in the right pane:

## 4.2 Factorial ANOVA

##### How to perform a factorial ANOVA in jamovi:

Check that your data contains two grouping variables and a continuous outcome variable. Your data should look something like this:

Select

`Analyses -> ANOVA -> ANOVA`

.

Move your outcome variable to

**Dependent Variable**and your grouping variables to**Fixed Factors**.

The result is shown in the right pane:

## 4.3 Repeated measures ANOVA

##### How to perform a repeated measures ANOVA in jamovi:

Check that your data contains a continuous outcome variable and that the data format is wide. Your data should look something like this:

Select

`Analyses -> ANOVA -> Repeated Measures ANOVA`

.

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).

`->`

Move your outcome variables to their respective cells in

**Repeated Measures Cells**.

The results are shown in the right pane:

## 4.4 Mixed ANOVA

##### How to perform a mixed ANOVA in jamovi:

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:

Select

`Analyses -> ANOVA -> Repeated Measures ANOVA`

.

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.

`->`

Move your outcome variables to their respective cells in

**Repeated Measures Cells**.

Move your grouping variables to

**Between Subject Factors**.

The result is shown in the right panel: