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Different documents sets
First off, an explanation of the difference between:
- Matching documents
- Top documents
- Filtered documents
When a query is issued, often a large number of documents will satisfy the query criteria (particularly for a common query like "obama"), these are called matching documents. These documents are not directly available to the widget (apart from top documents, see below), except
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Aggregations
Obviously all the matching documents can contribute to the "knowledge" that a query can provide, and the documents themselves are not the only objects returned from a query. Instead, relevant information to the analysis is summed/averaged/etc ("aggregated") across all matching documents, and these are referred to as the "aggregations". Examples include:
- Geo: lat/longs and their frequency in the document set
- Times: number of documents per period (day, week, etc) in the document set
- Entities: entity objects found in the document set, ranked by significance.
- Events: event objects found in the document set, ranked by frequency.
- (etc)
It should be noted that aggregations are sometimes ranked by frequency, sometimes summed by significance. This distinction will become more consistent in future versions of the tool.
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