on for the response variable (e.g. <code>log</code> or <code>sqrt</code>). Please use this 
argument instead of transforming data in the formula directly (see also details below).</p></td>
    </tr>
    <tr>
      <th>x.transf</th>
      <td><p>Transformation for the predictor variable (e.g. <code>log</code> or <code>sqrt</code>). Please use this 
argument instead of transforming data in the formula directly (see also details below).</p></td>
    </tr>
    <tr>
      <th>n.intra</th>
      <td><p>Number of 