0</code>. By default, <code>.d=1</code>.</p></td>
    </tr>
    <tr>
      <th>.uniqcheck</th>
      <td><p>Logical parameter. Set to TRUE to always check whether <code>.i</code> and <code>.t</code> uniquely identify observations in the data. By default this is set to FALSE and the check is only performed once per session, and only if at least one of <code>.i</code>, <code>.t</code>, or <code>.d</code> is set.</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="details"><a class="anchor" href="#d