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'''Compound-term processing,'''
Compound-term processing is a new approach to an old problem: how can one improve the relevance of search results while maintaining ease of use? Using this technique, a search for ''survival rates following a triple heart bypass in elderly people'' will locate documents about this topic even if this precise phrase is not contained in any document. This can be performed by a [[concept search]], which itself uses compound-term processing. This will extract the key concepts automatically (in this case "survival rates", "triple heart bypass" and "elderly people") and use these concepts to select the most relevant documents.
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== Techniques ==
In August 2003, [[Concept Searching Limited]] introduced the idea of using statistical compound-term processing.<ref>{{cite journal|url=http://www.conceptsearching.com/Web/UserFiles/File/Concept%20Searching%20Lateral%20Thinking.pdf|title=Lateral Thinking in Information Retrieval|journal=
CLAMOUR is a European collaborative project which aims to find a better way to classify when collecting and disseminating industrial information and statistics. CLAMOUR appears to use a linguistic approach, rather than one based on [[statistical model|statistical modelling]].<ref>[http://webarchive.nationalarchives.gov.uk/20040117000117/statistics.gov.uk/methods_quality/clamour/default.asp] National Statistics CLAMOUR project</ref>
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== History ==
Techniques for probabilistic weighting of single word terms date back to at least 1976 in the landmark publication by [[Stephen Robertson (computer scientist)|Stephen E. Robertson]] and [[Karen Spärck Jones]].<ref>{{Cite journal | doi = 10.1002/asi.4630270302| title = Relevance weighting of search terms| journal = Journal of the American Society for Information Science| volume = 27| issue = 3| pages = 129| year = 1976| last1 = Robertson | first1 = S. E. | authorlink1 = Stephen Robertson (computer scientist)| last2 = Spärck Jones | first2 = K. | authorlink2 = Karen Spärck Jones}}</ref> Robertson stated that the assumption of word independence is not justified and exists as a matter of mathematical convenience. His objection to the term independence is not a new idea, dating back to at least 1964 when H. H. Williams stated that "[t]he assumption of independence of words in a document is usually made as a matter of mathematical convenience".<ref>{{cite journal |last=WILLIAMS |first=J.H. |title=Results of classifying documents with multiple discriminant functions |url=http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0612272 |journal=
In 2004, Anna Lynn Patterson filed patents on "phrase-based searching in an information retrieval system"<ref>{{patent|US|20060031195}}</ref> to which [[Google]] subsequently acquired the rights.<ref>[http://www.seobythesea.com/2012/02/google-acquires-cuil-patent-applications/ Google Acquires Cuil Patent Applications]</ref>
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