e</code> can be used, including <code>ER</code> (equal-rates), 
<code>SYM</code> (symmetric), <code>ARD</code> (all-rates-different) and <code>meristic</code> (stepwise fashion).</p>
<p>Transformations to the phylogenetic tree from <code>fitDiscrete</code> can be used, i.e. <code>none</code>,
<code>EB</code>, <code>lambda</code>, <code>kappa</code> and<code>delta</code>.</p>
<p>See <code><a href='https://rdrr.io/pkg/geiger/man/fitDiscrete.html'>fitDiscrete</a></code> for more details on character models and