The union node is used to aggregate values without the prejudice inflicted by using the AND node the liberality of the OR node. It performs a weighted average of its child-nodes.

• Minimum number of child-nodes: 0
• Maximum number of child-nodes: no limit

The union node calculates the weighted average of its child-nodes. Weight is a node property that has meaning in only some situations. By default its value is 1, but can be changed to any numeric value.