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  • Static quality scores

  • We want top-ranking documents to be both relevant and authoritative

  • Relevance is being modeled by cosine scores

  • Authority is typically a query-independent property of a document

  • Examples of authority signals

    • Wikipedia among websites

    • Articles in certain newspapers

    • A paper with many citations

    • Many bitly’s, diggs or marks

    • (Pagerank)

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