title: Does boxplot group data before plotting implicitly?
body: <p>I have a dataframe from which I am trying to create a boxplot.</p>
  
  <p>The dataframe is as follows</p>
  
  <pre><code>CopyNumber        LOH
       2            yes
       2            no
       3            yes
       4            no
       3            maybe
       8            maybe
       2            yes
       2            no
       3            yes
       4            no
       3            maybe
       8            maybe
  </code></pre>
  
  <p>I would like to create a boxplot where the x-axis is LOH status and y-axis is CopyNumber. 
  In my attempt the boxplot only creates two groups rather than three (for yes, no and maybe). How can I get the boxplot to create these groupings rather than me having to create these groups explicitly?</p>