<span class="co">#&gt; 9   165.25751  1880.9845</span></span>
<span><span class="co">#&gt; 10    0.00000  1653.2976</span></span>
<span><span class="co">#&gt; 11  487.38500  2669.3362</span></span>
<span><span class="co">#&gt; 12 1911.87165  4820.0426</span></span></code></pre></div>
<p>If more than one type of subpopulation is of interest, then
<code>subpop</code> can be a vector of subpopulation variables and
separate analyses are performed for each subpopulation. If both
<code>vars</code> and <code>subpo