ult is 10.</p></dd>

        <dt>optimizer</dt>
<dd><p>character string denoting the optimizer to be used; available
            options are <code>"optim"</code> (default), <code>"nlminb"</code> and
            <code>"optimParallel"</code>, the last option implemented in the
            <b>optimParallel</b> package.</p></dd>

        <dt>optim_method</dt>
<dd><p>character string denoting the type of <code><a href="https://rdrr.io/r/stats/optim.html" class="external-link">optim</a></code>
            algorit