hm to be used when <code>optimizer = "optim"</code>; default is the BFGS
            algorithm.</p></dd>

        <dt>parscale_betas</dt>
<dd><p>the control argument <code>parscale</code> of <code><a href="https://rdrr.io/r/stats/optim.html" class="external-link">optim</a></code> for
            the fixed-effects; default is 0.1.</p></dd>

        <dt>parscale_D</dt>
<dd><p>the control argument <code>parscale</code> of <code><a href="https://rdrr.io/r/stats/optim.html" class="external-link">optim</a></code>