code> and <code>tol2</code> are for checking convergence in
            successive parameter values; <code>tol3</code> is similar to <code>reltop</code> of
            <code><a href="https://rdrr.io/r/stats/optim.html" class="external-link">optim</a></code>; default values are <code>1e-03</code>, <code>1e-04</code>, and
            <code>1e-08</code>, respectively.</p></dd>

        <dt>numeric_deriv</dt>
<dd><p>character string denoting the type of numerical derivatives
            to be used. Options are 