.63   92      183    10.3     4</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 5    3.53    143    671.0 113.15   72      136    10.9     3</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 6    3.98     50    944.0  93.00   63       NA    11.0     3</span>
<span class="r-in"></span>
<span class="r-in"><span class="co">## Make categorical variables factors</span></span>
<span class="r-in"><span class="va">varsToFactor</span> <span class="op">&lt;-</span> <span class="fu"><a href="