ps://rdrr.io/r/base/factor.html" class="external-link">factor</a></span><span class="op">(</span><span class="va">region</span><span class="op">)</span>, data <span class="op">=</span> <span class="va">Toxic</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 	Kruskal-Wallis rank sum test</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr