 indices are determined as follows: If number of observations in the passed data matrix is smaller than number of covariates, 500 bootstrap samples without replacement are generated ("subsampling"), else 500 bootstrap samples with replacement.</p></td>
    </tr>
    <tr>
      <th>fit.fun</th>
      <td><p>function returning a fitted model, see Details.</p></td>
    </tr>
    <tr>
      <th>complexity</th>
      <td><p>if the choice of a complexity parameter is necessary, for example the number of boosting 