relevance

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relevance

(information science)
A measure of how closely a given object (file, web page, database record, etc.) matches a user's search for information.

The relevance algorithms used in most large web search engines today are based on fairly simple word-occurence measurement: if the word "daffodil" occurs on a given page, then that page is considered relevant to a query on the word "daffodil"; and its relevance is quantised as a factor of the number of times the word occurs in the page, on whether "daffodil" occurs in title of the page or in its META keywords, in the first N words of the page, in a heading, and so on; and similarly for words that a stemmer says are based on "daffodil".

More elaborate (and resource-expensive) relevance algorithms may involve thesaurus (or synonym ring) lookup; e.g. it might rank a document about narcissuses (but which may not mention the word "daffodil" anywhere) as relevant to a query on "daffodil", since narcissuses and daffodils are basically the same thing. Ditto for queries on "jail" and "gaol", etc.

More elaborate forms of thesaurus lookup may involve multilingual thesauri (e.g. knowing that documents in Japanese which mention the Japanese word for "narcissus" are relevant to your search on "narcissus"), or may involve thesauri (often auto-generated) based not on equivalence of meaning, but on word-proximity, such that "bulb" or "bloom" may be in the thesaurus entry for "daffodil".

Word spamming essentially attempts to falsely increase a web page's relevance to certain common searches.

See also subject index.
References in classic literature ?
Whenever the effect resulting from a stimulus to an organism differs according to the past history of the organism, without our being able actually to detect any relevant difference in its present structure, we will speak of "mnemic causation," provided we can discover laws embodying the influence of the past.
How is the date when a foreign entity becomes relevant for U.S.
PSC should include articles authored by professionals in a wide range of positions relevant to school counseling.
(2) Evidence that is requested and is relevant and not unduly burdensome to produce;
* Identification of likely sources of relevant information.
He could've used Horngren's relevant revenues and costs terminology: Alt 1 Alt 2 Relevant revenues R$ 103,320 R$ 67,680 Relevant expenses R$ 15,000 R$ 15,000 Differential profit R$ 88,320 R$ 52,680
Unlike Mooney or oscillatory tests, whose measuring ranges are below the process relevant measuring range, the RCR is said to cover the whole relevant range.
In addition to proposals and reports for their community-based projects, students wrote additional papers relevant for their assigned community agencies.
If you are not able to come up with enough relevant details, it would be difficult for even a well meaning airline to be able to respond appropriately.
Goldfire Innovator's "semantic knowledge engine" retrieves information relevant to the problem at hand and indexes the content.
The K25 Award will support the career development of quantitatively trained investigators who make a commitment to basic or clinical biomedicine, bioengineering, bioimaging, or behavioral research that is relevant to the NIH mission.
It sponsored such places as a skate bowl in Brooklyn, an especially powerful example of discreet yet relevant marketing.