title: Changing individual column values for groups within a data set
body: <p>I have a data set that looks like this:</p>
  
  <pre><code>Name    Difference  Status
  A       2           No Action
  A       1           No Action
  B       3           No Action
  B       5           No Action
  C       4           No Action
  C       1           No Action
  </code></pre>
  
  <p>For each group of <code>Name</code> within this data set, I am trying to set the value of the <code>Status</code> column to "Renewed" for the row with the lowest <code>difference</code> value.</p>
  
  <pre><code>Name    Difference  Status
  A       2           No Action
  A       1           Renewed
  B       3           Renewed
  B       5           No Action
  C       4           No Action
  C       1           Renewed
  </code></pre>
  
  <p>What would be the most optimal way of doing this for a large data set with additional columns. I thought of doing this with Groupby + Transform but couldn't figure out how to change individual column values for each group. Any help would be greatly appreciated. Thanks.</p>