uster stop is suppressed. Useful for debugging of sessions on slaves. Note that the next <code>peperr</code> call forces cluster stop, except if called with <code>noclusterstart=TRUE</code>.</p></td>
    </tr>
    <tr>
      <th>aggregation.fun</th>
      <td><p>function that evaluates the prediction error for a model fitted by the function given in <code>fit.fun</code>, see Details. If not specified, function <code>aggregation.pmpec</code> is taken if response is survival object, in case of binary response