li><p><code>data</code>: Which data do we want to apply the tree to? We
can specify <code>data = "train"</code> or <code>data = "test"</code> to
distinguish between a training and testing dataset (if available) in the
<code>FFTrees</code> object. As not all <code>FFTrees</code> objects
contain test data, <code>data</code> is set to
<code>data = "train"</code> by default.</p></li>
</ul>
<!-- Note on consistency of data and tree: --><p>As the <code>data</code> and <code>tree</code> arguments can both
refer to