How is 'recent frequent usage' (RFU) calculated?

Screenshot: Top ten tags by recent frequent usage

The 'recent frequent usage' of a tag on this site is calculated as the number of articles published in the last 52 weeks tagged with a specified term.

On this basis, recency frequent usage ranges from 0 upwards :

  • 0 indicates that no references to a specified term occur within the most recent year
  • higher numbers indicate total references to a specified term occurring within the most recent year

As such, recent frequent usage measures extent of topical discussion and it provides one of two key measures contributing to trending factor.

Note: 'bands of recency' charts provide more statistics on time-bands associated with a specific term. You can find 'bands of recency' statistics by following chart links  in overviews of keywords, organisations, and projects.

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Data calculation: copyright image, used under license from