   <dt>max_coef_value</dt>
<dd><p>numeric scalar denoting the maximum allowable value for the
            fixed effects coefficients during the optimization; default is 10.</p></dd>

        <dt>max_phis_value</dt>
<dd><p>numeric scalar denoting the maximum allowable value for the
            shape/dispersion parameter of the negative binomial distribution during the
            optimization; default is <code>exp(10)</code>.</p></dd>

        <dt>verbose</dt>
<dd><p>logical; print information during the opt