iter<a class="anchor" aria-label="anchor" href="#arg-maxiter"></a></dt>
<dd><p>optional maximum number of iterations for the Marquardt
iterative algorithm. By default, maxiter=500.</p></dd>


<dt id="arg-subset">subset<a class="anchor" aria-label="anchor" href="#arg-subset"></a></dt>
<dd><p>a specification of the rows to be used: defaults to all rows.
This can be any valid indexing vector for the rows of data or if that is not
supplied, a data frame made up of the variable used in formula.</p></dd>


<dt id