An aggregation method reduces the performance values of the test (and possibly the training sets) to a single value. To see all possible implemented aggregations look at aggregations.
The aggregation can access all relevant information of the result after resampling and combine them into a single value. Though usually something very simple like taking the mean of the test set performances is done.
Object members:
- id (
character(1)) Name of the aggregation method.
- name (
character(1)) Long name of the aggregation method.
- properties (character)
Properties of the aggregation.
- fun (`function(task, perf.test, perf.train, measure, group, pred)])
Aggregation function.