HierarchicalForecast offers a collection of reconciliation methods, including BottomUp, TopDown, MiddleOut, MinTrace and ERM.

Classic reconciliation methods:
- BottomUp: Simple addition to the upper levels.
- TopDown: Distributes the top levels forecasts trough the hierarchies.
Alternative reconciliation methods:
- MiddleOut: It anchors the base predictions in a middle level. The levels above the base predictions use the bottom-up approach, while the levels below use a top-down.
- MinTrace: Minimizes the total forecast variance of the space of coherent forecasts, with the Minimum Trace reconciliation.
- ERM: Optimizes the reconciliation matrix minimizing an L1 regularized objective.