                  dif        <span class="op">=</span> <span class="st">"perc"</span>,        <span class="co"># type of difference</span></span></span>
<span class="r-in"><span>                      comparisons <span class="op">=</span> <span class="st">"all.vs.all"</span>, <span class="co"># differences to consider</span></span></span>
<span class="r-in"><span>                      method     <span class="op">=</span> <span class="st">"param"</span>,       <span class="co"># method ("param", "boot")</span