The Number of Scholarly Documents on the Public Web
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{"title"=>"The number of scholarly documents on the public web", "type"=>"journal", "authors"=>[{"first_name"=>"Madian", "last_name"=>"Khabsa", "scopus_author_id"=>"55155604500"}, {"first_name"=>"C. Lee", "last_name"=>"Giles", "scopus_author_id"=>"55665046700"}], "year"=>2014, "source"=>"PLoS ONE", "identifiers"=>{"isbn"=>"1932-6203", "pmid"=>"24817403", "doi"=>"10.1371/journal.pone.0093949", "issn"=>"19326203", "pui"=>"373132348", "sgr"=>"84901218198", "scopus"=>"2-s2.0-84901218198"}, "id"=>"e2e71172-3c10-32fd-9dfd-c7990ae5ed83", "abstract"=>"The number of scholarly documents available on the web is estimated using capture/recapture methods by studying the coverage of two major academic search engines: Google Scholar and Microsoft Academic Search. Our estimates show that at least 114 million English-language scholarly documents are accessible on the web, of which Google Scholar has nearly 100 million. Of these, we estimate that at least 27 million (24%) are freely available since they do not require a subscription or payment of any kind. In addition, at a finer scale, we also estimate the number of scholarly documents on the web for fifteen fields: Agricultural Science, Arts and Humanities, Biology, Chemistry, Computer Science, Economics and Business, Engineering, Environmental Sciences, Geosciences, Material Science, Mathematics, Medicine, Physics, Social Sciences, and Multidisciplinary, as defined by Microsoft Academic Search. In addition, we show that among these fields the percentage of documents defined as freely available varies significantly, i.e., from 12 to 50%.", "link"=>"http://www.mendeley.com/research/number-scholarly-documents-public-web", "reader_count"=>146, "reader_count_by_academic_status"=>{"Unspecified"=>4, "Professor > Associate Professor"=>6, "Librarian"=>24, "Researcher"=>28, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>19, "Student > Postgraduate"=>4, "Student > Master"=>21, "Other"=>12, "Student > Bachelor"=>15, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>6}, "reader_count_by_user_role"=>{"Unspecified"=>4, "Professor > Associate Professor"=>6, "Librarian"=>24, "Researcher"=>28, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>19, "Student > Postgraduate"=>4, "Student > Master"=>21, "Other"=>12, "Student > Bachelor"=>15, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>6}, "reader_count_by_subject_area"=>{"Unspecified"=>8, "Agricultural and Biological Sciences"=>9, "Arts and Humanities"=>7, "Business, Management and Accounting"=>6, "Chemistry"=>1, "Computer Science"=>50, "Earth and Planetary Sciences"=>2, "Economics, Econometrics and Finance"=>2, "Engineering"=>8, "Environmental Science"=>3, "Biochemistry, Genetics and Molecular Biology"=>1, "Medicine and Dentistry"=>8, "Design"=>1, "Sports and Recreations"=>1, "Physics and Astronomy"=>4, "Psychology"=>6, "Social Sciences"=>27, "Linguistics"=>2}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>8}, "Social Sciences"=>{"Social Sciences"=>27}, "Sports and Recreations"=>{"Sports and Recreations"=>1}, "Physics and Astronomy"=>{"Physics and Astronomy"=>4}, "Psychology"=>{"Psychology"=>6}, "Unspecified"=>{"Unspecified"=>8}, "Environmental Science"=>{"Environmental Science"=>3}, "Arts and Humanities"=>{"Arts and Humanities"=>7}, "Design"=>{"Design"=>1}, "Engineering"=>{"Engineering"=>8}, "Chemistry"=>{"Chemistry"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>2}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>9}, "Computer Science"=>{"Computer Science"=>50}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>6}, "Linguistics"=>{"Linguistics"=>2}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}}, "reader_count_by_country"=>{"Republic of Singapore"=>1, "Argentina"=>1, "United States"=>7, "Japan"=>2, "United Kingdom"=>7, "Ghana"=>1, "Switzerland"=>1, "Portugal"=>2, "Spain"=>6, "Russia"=>1, "New Zealand"=>1, "Canada"=>1, "Sweden"=>1, "Austria"=>1, "Iran"=>1, "Norway"=>1, "Ireland"=>2, "Luxembourg"=>1, "Brazil"=>2, "South Africa"=>1, "Bulgaria"=>1, "Germany"=>6}, "group_count"=>13}

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Article Coverage

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1492130"], "description"=>"<p>Then is an estimate of ,the fraction of documents indexed by MAS. The total number of documents N would be where is the size of MAS.</p>", "links"=>[], "tags"=>["Information technology", "databases", "text mining", "mathematics", "Statistics (mathematics)", "Statistical methods", "Research assessment", "Bibliometrics", "Publication practices", "Research monitoring", "Science education", "Sociology", "communications", "documents", "citations", "mas"], "article_id"=>1022183, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Madian Khabsa", "C. Lee Giles"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0093949.g001", "stats"=>{"downloads"=>1, "page_views"=>11, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_To_estimate_the_number_of_scientific_documents_on_the_web_let_equal_the_number_of_citations_found_in_both_Scholar_and_MAS_for_a_collection_of_papers_and_let_be_the_number_of_citations_reported_by_Scholar_/1022183", "title"=>"To estimate the number of scientific documents on the web, , let equal the number of citations found in both Scholar and MAS for a collection of papers, and let be the number of citations reported by Scholar.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-05-09 03:14:14"}
  • {"files"=>["https://ndownloader.figshare.com/files/1492131"], "description"=>"<p>Total and Google Scholar are estimates.</p>", "links"=>[], "tags"=>["Information technology", "databases", "text mining", "mathematics", "Statistics (mathematics)", "Statistical methods", "Research assessment", "Bibliometrics", "Publication practices", "Research monitoring", "Science education", "Sociology", "communications", "documents", "scholarly", "engines"], "article_id"=>1022184, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Madian Khabsa", "C. Lee Giles"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0093949.g002", "stats"=>{"downloads"=>5, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relative_number_of_documents_by_scholarly_search_engines_and_databases_/1022184", "title"=>"Relative number of documents by scholarly search engines and databases.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-05-09 03:14:14"}
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  • {"files"=>["https://ndownloader.figshare.com/files/1492134"], "description"=>"<p>The percentage of publicly available scholarly documents found in Google Scholar.</p>", "links"=>[], "tags"=>["Information technology", "databases", "text mining", "mathematics", "Statistics (mathematics)", "Statistical methods", "Research assessment", "Bibliometrics", "Publication practices", "Research monitoring", "Science education", "Sociology", "communications", "scholarly", "documents", "google"], "article_id"=>1022187, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Madian Khabsa", "C. Lee Giles"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0093949.t002", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_percentage_of_publicly_available_scholarly_documents_found_in_Google_Scholar_/1022187", "title"=>"The percentage of publicly available scholarly documents found in Google Scholar.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-05-09 03:14:14"}
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PMC Usage Stats | Further Information

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Relative Metric

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