="desc" /></colgroup>
    <tr>
      <th>.var</th>
      <td><p>Vector to be modified.</p></td>
    </tr>
    <tr>
      <th>.df</th>
      <td><p>Data frame, pibble, or tibble (usually the one containing <code>.var</code>) that contains the panel structure variables either listed in <code>.i</code> and <code>.t</code>, or earlier declared with <code><a href='as_pibble.html'>as_pibble()</a></code>. If <code>tlag</code> is called inside of a <code>dplyr</code> verb, this can be omitted and the data will be p