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It shows that the potential relevance of a document increases exponentially as the number of search methods retrieving it increases \u2014 called the Authority Effect. It also shows that documents higher up in ranked lists and found by more systems are more likely to be relevant \u2014 called the Ranking Effect. Both effects can help explain why major data fusion methods perform well.<\/jats:p>","DOI":"10.1002\/meet.14504201175","type":"journal-article","created":{"date-parts":[[2006,10,18]],"date-time":"2006-10-18T10:11:13Z","timestamp":1161166273000},"source":"Crossref","is-referenced-by-count":11,"title":["How the overlap between the search results of different retrieval systems correlates with document relevance"],"prefix":"10.1002","volume":"42","author":[{"given":"Anselm","family":"Spoerri","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,10,18]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"crossref","unstructured":"Aslam J.&Savell R.(2003).On the Effectiveness of Evaluating Retrieval Systems in the Absence of Relevance Judgments. 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