ld match exactly the names
of the variables in the model.</p></dd>


<dt id="arg-subject">subject<a class="anchor" aria-label="anchor" href="#arg-subject"></a></dt>
<dd><p>character specifying the name of the grouping structure.
If NULL (the default), the same as in the model will be used.</p></dd>


<dt id="arg-classpredre">classpredRE<a class="anchor" aria-label="anchor" href="#arg-classpredre"></a></dt>
<dd><p>logical indicating if class specific random effects should be returned.
By default, classpredRE