MBER..   BASE   COMPARE 
#&gt;   ------------------------------------------
#&gt;    Species         1        setosa   &lt;NA&gt;   
#&gt;   ------------------------------------------
#&gt; </div><div class='input'>
<span class='co'>#### Sample data frames</span>

<span class='no'>DF1</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/data.frame'>data.frame</a></span>(
    <span class='kw'>id</span> <span class='kw'>=</span> <span class='fu'><a