Aggregation functions by default aggregate over the current selection of field values. The current selection can be referred to as a set of field values. You can define other sets of field values and use them in your visualizations instead of the current selection. For example, in a dashboard, you may want to show market share of a product across all regions, irrespective of the current selections.
Defining a set of field values is referred to as defining a set expression, and using set expressions to analyze data is referred to as set analysis.
Set expressions always begin and end in curly brackets. For example, sum({1} Sales), where {1} is a set expression.
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