Online from: 1977
Subject Area: Library and Information Studies
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|Title:||Visualizing overlap and rank differences among web-wide search engines: Some free tools and services|
|Author(s):||Péter Jacsó, (University of Hawaii, Manoa, Hawaii, USA)|
|Citation:||Péter Jacsó, (2005) "Visualizing overlap and rank differences among web-wide search engines: Some free tools and services", Online Information Review, Vol. 29 Iss: 5, pp.554 - 560|
|Keywords:||Information retrieval, Search engines, Search output|
|Article type:||General review|
|DOI:||10.1108/14684520510628927 (Permanent URL)|
|Publisher:||Emerald Group Publishing Limited|
Purpose – To compare the performance of different search engines, highlighting the overlap and rank differences.
Design/methodology/approach – Presents results of an overlap test search series among traditional CD-ROM indexing/abstracting databases since the mid-1980s, web databases, and authors' own polysearch engine, and reviews Google Scholar.
Findings – Finds that overlap is minimal among web-wide search engines which crawl and index the mostly unstructured open web; and that overlap among Google Scholar and the native search engines is far less than the ideal 100 per cent in the optimal context of crawling and indexing highly-structured and metadata-rich collections.
Originality/value – Reinforces the existing view that for comprehensive searches one must search more than one database. Highlights and recommends several very good search engine sites.
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