Indexing consistency

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The indexing consistency or indexing concordance is a measure of how uniform descriptors in indexing will be awarded. It is calculated for a documentation unit indexed several times as

The indexing consistency is used in classic information retrieval as a measure of the quality of the indexing, while in joint indexing, a lower consistency is compensated for by a higher number of indexers.

The indexing consistency is usually higher with automatic methods, but the indexing accuracy is often lower.


  • Chapter 5: Consistency of Indexing . In: FW Lancaster: Indexing and abstracting in theory and practice . 2nd Edition. Library Association Publishing, London, 1998, pp. 71–75 (there is also a new edition from 2003)