o">#&gt; Standard Error calculation: Hessian from optim </span></span>
<span><span class="co">#&gt; _______________________________________________________________</span></span>
<span><span class="co">#&gt;       AIC     BIC</span></span>
<span><span class="co">#&gt;   63985.1 63985.1</span></span>
<span><span class="co">#&gt; _______________________________________________________________</span></span>
<span><span class="co">#&gt;    Estimate  Std. Error Z value Pr(&gt;|z|)    </span></span>
<span><span cl