The data can have the form , where the number of coordinates is equal to the number of variables in the list vars.
For data of the form , a one-way analysis of variance can be obtained without explicitly specifying the model and variable.
The model argument can be a list containing main effects and interactions. Main effects are elements of vars, and interactions are products of main effects.
A full factorial model including all interactions between variables can be specified as {x, y, ..., All}.