# Repeated measures anova

To compare changes in means over time, repeated measures anova can be used. In this example, a dataset/dataframe called `dat`

contains a categorical independent variable `groupingVariable`

, and contains the data for the continuous variable in three variables, each corresponding to a measurement moment, respectively `dependentVariable_t0`

, `dependentVariable_t1`

, and `dependentVariable_t2`

.

## SPSS

```
GLM
/dependentVariable_t0 dependentVariable_t1 dependentVariable_t2
/WSFACTOR= groupingVariable 3 Simple
/WSDESIGN= groupingVariable
/PRINT=DESCRIPTIVES ETASQ
```

## R

```
fanova(dat,
y = c('dependentVariable_t0',
'dependentVariable_t1',
'dependentVariable_t2'),
between = 'groupingVariable')
```