her words, they are possible future sample paths of the time series. But if future=FALSE, the historical
data are ignored, and the simulations are possible realizations of the time series model that
are not connected to the original data.</p></td>
    </tr>
    <tr>
      <th>Length</th>
      <td><p>length of the simulated time series. If future = FALSE, the Length agument should be NA.</p></td>
    </tr>
    <tr>
      <th>extralength</th>
      <td><p>extra length need to be added for simulated time seri