p>In case of survival response, the user may additionally provide a function for partial log likelihood calculation, if he uses an own function for model fit, called <code>PLL.class</code>. If prediction error curves are used for aggregation (<code>aggregation.pmpec</code>), a predictProb method has to be provided, i.e. for each model of class <code>class</code> <code>predictProb.class</code>, see there.</p></li>
</ol>

<p>Concerning parallelisation, there are three possibilities to run <code>peperr</code>: