# Factorial anova

To compare the means in multiple groups defined by multiple categorical predictors (i.e. factors), factorial analysis of variance can be used. In this example, a dataset/dataframe called `dat`

contains categorical variables `groupingVariable`

and `dichotomousVariable`

and a continuous variable `dependentVariable`

.

## SPSS

```
UNIANOVA dependentVariable BY groupingVariable dichotomousVariable
/PLOT = PROFILE(groupingVariable * dichotomousVariable)
/DESIGN = groupingVariable D groupingVariable * dichotomousVariable.
```

## R

```
fanova(dat,
y = 'dependentVariable',
between = c('groupingVariable',
'dichotomousVariable'),
plot=TRUE)
```