ss="op">(</span><span class="st">"n/a"</span>,<span class="cn">NA</span>,<span class="st">"Yes"</span>,<span class="st">"No"</span><span class="op">)</span><span class="op">)</span>
<span class="co"># Convert n/a and no to NA</span>
<span class="fu"><a href="https://rdrr.io/r/utils/head.html" class="external-link">head</a></span><span class="op">(</span><span class="fu"><a href="reference/recode_as_na.html">recode_as_na</a></span><span class="op">(</span><span class="va">dummy_test</span>, value <span class