@Override
 protected StatisticResult recalculateStatisticResult(final UserRequest ureq) {
   // recalculate the statistic result based on the from and to dates.
   // do this by going via sql (see WeeklyStatisticManager)
   final IStatisticManager weeklyStatisticManager = getStatisticManager();
   final StatisticResult statisticResult =
       weeklyStatisticManager.generateStatisticResult(
           ureq,
           getCourse(),
           getCourseRepositoryEntryKey(),
           form_.getFromDate(),
           form_.getToDate());
   return statisticResult;
 }