ss="anchor" aria-label="anchor" href="#arg-outcomec"></a></dt>
<dd><p>Optional formula or matrix for the correlation model (<code>rho</code>).</p></dd>


<dt id="arg-drop-levels">drop.levels<a class="anchor" aria-label="anchor" href="#arg-drop-levels"></a></dt>
<dd><p>Logical. If <code>TRUE</code>, drops unused factor levels.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>A list with the following components