icked up automatically.</p></td>
    </tr>
    <tr>
      <th>.fill</th>
      <td><p>Vector of values to be overwritten. Just <code>NA</code> by default.</p></td>
    </tr>
    <tr>
      <th>.backwards</th>
      <td><p>By default, values of newly-created observations are copied from the most recently available period. Set <code>.backwards = TRUE</code> to instead copy values from the closest *following* period.</p></td>
    </tr>
    <tr>
      <th>.resolve</th>
      <td><p>If there is more than one obs