s of variables that should be forced
into all estimated models. (Not yet implemented.)</p></td>
    </tr>
    <tr>
      <th>screen</th>
      <td><p>logical, whether or not to perform an initial
screen for outliers.  Highly experimental, use at own risk.
Default = <code>FALSE</code>.</p></td>
    </tr>
    <tr>
      <th>redundant</th>
      <td><p>logical, whether or not to add a redundant
variable.  Default = <code>TRUE</code>.</p></td>
    </tr>
    <tr>
      <th>seed</th>
      <td><p>random seed for 