kt_adj</code>, and <code>sim</code>.</p></td>
    </tr>
    <tr>
      <th>estimation_method</th>
      <td><p>a character specifying an estimation method for
<code>sim</code> model.</p></td>
    </tr>
    <tr>
      <th>estimation_start</th>
      <td><p>an object of <code>Date</code> class giving the first date
of the estimation period.</p></td>
    </tr>
    <tr>
      <th>estimation_end</th>
      <td><p>an object of <code>Date</code> class giving the last date of
the estimation period.</p></td>
    </t