private List<Double> getEstimationAccuracyDeviations() {
if (this.getRootTask() == null) {
throw new RuntimeException("Root task is null");
}
CalculateFinishedTasksEstimationDeviationVisitor visitor = new CalculateFinishedTasksEstimationDeviationVisitor();
TaskElement rootTask = getRootTask();
rootTask.acceptVisitor(visitor);
return visitor.getDeviations();
}