Search engines. The number of Internet hosts exceeded... 1.000 in 1984 10.000 in 1987 100.000 in 1989 1.000.000 in 1992 10.000.000 in 1996 100.000.000.

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Presentation transcript:

Search engines

The number of Internet hosts exceeded in in in in in in 2000

Schemes to locate information Supervised links between sites –ask at the reference desk Classification of documents –search in the catalog Automated searching –wander around the library

The most popular search engines Year 2000 AltaVista Yahoo HotBot Year 2001 Google NorthernLight AltaVista

Boolean search in AltaVista

Specifying field content in HotBot

Natural language interface in AskJeeves

Three examples of search strategies Rank web pages based on popularity Rank web pages based on word frequency Match query to an expert database All the major search engines use a mixed strategy in ranking web pages and responding to queries

Rank based on word frequency Library analogue: Keyword search Basic factors in HotBot ranking of pages: –words in the title –keyword meta tags –word frequency in the document –document length

Alternative word frequency measures Excite uses a thesaurus to search for what you want, rather than what you ask for AltaVista allows you to look for words that occur within a set distance of each other NorthernLight weighs results by search term sequence, from left to right

Rank based on popularity Library analogue: citation index The Google strategy for ranking pages: –Rank is based on the number of links to a page –Pages with a high rank have a lot of other web pages that link to it –The formula is on the Google help page

More on popularity ranking The Google philosophy is also applied by others, such as NorthernLight HotBot measures the popularity of a page by how frequently users have clicked on it in past search results

Expert databases: Yahoo! An expert database contains predefined responses to common queries A simple approach is subject directory, e.g. in Yahoo!, which contains a selection of links for each topic The selection is small, but can be useful Library analogue: Trustworthy references

Expert databases: AskJeeves AskJeeves has predefined responses to various types of common queries These prepared answers are augmented by a meta-search, which searches other SEs Library analogue: Reference desk

Best wines in France: AskJeeves

Best wines in France: HotBot

Best wines in France: Google

Linux in Iceland: Google

Linux in Iceland: HotBot

Linux in Iceland: AskJeeves

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