#&gt; 1    NA      NA  7.4   67     5   1</span>
<span class="co">#&gt; 2    36      NA  8.0   72     5   2</span>
<span class="co">#&gt; 3    12      NA 12.6   74     5   3</span>
<span class="co">#&gt; 4    18      NA 11.5   62     5   4</span>
<span class="co">#&gt; 5    NA      NA 14.3   56     5   5</span>
<span class="co">#&gt; 6    28      NA 14.9   66     5   6</span></code></pre></div>
</div>
<div class="section level2">
<h2 id="recoding-na-as">Recoding NA as<a class="anchor" aria-label="anchor" hr