# Mix [Obj,Date]

### Description
Similar to the block `Mix`, but combines `[OBJ,DATE]` tuples from several inputs into a single output.
With the parameters several merging/aggregation-techniques can be selected.
Most common scenario: if an object occurs in multiple inputs, it is an indication that this object is more relevant.

### Input
- `MIXLIST [OBJ,DATE]`: one or more inputs that should be combined

### Output
- `RESULT [OBJ,DATE]`: the combined output of all inputs

### Parameters
- `Input Score normalisation`
  - `None`: don’t change probabilities as they come in
  - `Max`: divide by the maximum score in each input
  - `Standard`: performs standard score normalisation "combSUM score combination" (J.H.Lee, 1997)

- `Score combination`
  - `Disjunctive`: objects must occur in at least 1 input (default)
  - `Conjunctive` : objects must occur in all inputs

- `Score aggregation`: defines how the output scores are calculated (when an instance occurs in multiple inputs)
  - `SUM`: sums the weights of the individual inputs. Use `SUM` if the signals are completely independent (default)
  - `MAX`: selects the highest weight of the object. Often used in combination with `Conjunctive`.
  - `MIN`: selects the lowest weight of the object
  - `PROD`: multiplies of the individual inputs. Often used in combination with `Conjunctive`.
  - `AVG`: selects the average weight of the object (only over inputs that contain the input)
  - `DISTINCT`:  aggregates evidence (formula: `1 - prod(1 - p)`)
  - `ALL`: don't aggregate, and output all tuples from all inputs as is