 Default to NULL, all parameters are
estimated.</p></dd>


<dt id="arg-verbose">verbose<a class="anchor" aria-label="anchor" href="#arg-verbose"></a></dt>
<dd><p>logical indicating if information about computation should be
reported. Default to TRUE.</p></dd>


<dt id="arg-returndata">returndata<a class="anchor" aria-label="anchor" href="#arg-returndata"></a></dt>
<dd><p>logical indicating if data used for computation should be
returned. Default to FALSE, data are not returned.</p></dd>


<dt id="arg-var-ti