 1. Remove NA </span>
<span class="va">out.NA</span> <span class="op">&lt;-</span> <span class="va">df</span><span class="op">[</span><span class="fu">stats</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/stats/complete.cases.html" class="external-link">complete.cases</a></span><span class="op">(</span><span class="va">df</span><span class="op">)</span>,<span class="op">]</span>

<span class="co"># 2. Classification And Regression Trees / Random Forests</span>
<span class="va">im