      <td><p>By default, if <code>.i</code> is specified or found in the data, <code>panel_locf()</code> will group the data by <code>.i</code>, ignoring any grouping already implemented. Set <code>.group_i = FALSE</code> to avoid this.</p></td>
    </tr>
    <tr>
      <th>.i</th>
      <td><p>Quoted or unquoted variables that identify the individual cases. Note that setting any one of <code>.i</code>, <code>.t</code>, or <code>.d</code> will override all three already applied to the data, and will return 