tr><td>
          <p><code><a href="group_split.html">group_split()</a></code> </p>
        </td>
        <td><p>Split data frame by groups</p></td>
      </tr><tr><td>
          <p><code><a href="first.html">first()</a></code> <code><a href="first.html">last()</a></code> <code><a href="first.html">nth()</a></code> </p>
        </td>
        <td><p>Extract the first, last, or nth value from a vector</p></td>
      </tr><tr><td>
          <p><code><a href="if_all.html">if_all()</a></code> <code><a href="if_a