Inflated Impact Factors? The True Impact of Evolutionary Papers in Non-Evolutionary Journals
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{"title"=>"Inflated impact factors? The true impact of evolutionary papers in non-evolutionary journals", "type"=>"journal", "authors"=>[{"first_name"=>"Erik", "last_name"=>"Postma", "scopus_author_id"=>"15754909500"}], "year"=>2007, "source"=>"PLoS ONE", "identifiers"=>{"issn"=>"19326203", "pui"=>"351472452", "sgr"=>"41549087434", "doi"=>"10.1371/journal.pone.0000999", "scopus"=>"2-s2.0-41549087434", "isbn"=>"1932-6203", "pmid"=>"17912376"}, "id"=>"ccdea514-bce9-3495-9aea-6ff54a59083f", "abstract"=>"Amongst the numerous problems associated with the use of impact factors as a measure of quality are the systematic differences in impact factors that exist among scientific fields. While in theory this can be circumvented by limiting comparisons to journals within the same field, for a diverse and multidisciplinary field like evolutionary biology, in which the majority of papers are published in journals that publish both evolutionary and non-evolutionary papers, this is impossible. However, a journal's overall impact factor may well be a poor predictor for the impact of its evolutionary papers. The extremely high impact factors of some multidisciplinary journals, for example, are by many believed to be driven mostly by publications from other fields. Despite plenty of speculation, however, we know as yet very little about the true impact of evolutionary papers in journals not specifically classified as evolutionary. Here I present, for a wide range of journals, an analysis of the number of evolutionary papers they publish and their average impact. I show that there are large differences in impact among evolutionary and non-evolutionary papers within journals; while the impact of evolutionary papers published in multidisciplinary journals is substantially overestimated by their overall impact factor, the impact of evolutionary papers in many of the more specialized, non-evolutionary journals is significantly underestimated. This suggests that, for evolutionary biologists, publishing in high-impact multidisciplinary journals should not receive as much weight as it does now, while evolutionary papers in more narrowly defined journals are currently undervalued. Importantly, however, their ranking remains largely unaffected. While journal impact factors may thus indeed provide a meaningful qualitative measure of impact, a fair quantitative comparison requires a more sophisticated journal classification system, together with multiple field-specific impact statistics per journal.", "link"=>"http://www.mendeley.com/research/inflated-impact-factors-true-impact-evolutionary-papers-nonevolutionary-journals", "reader_count"=>89, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>6, "Researcher"=>33, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>11, "Student > Postgraduate"=>4, "Other"=>4, "Student > Master"=>5, "Student > Bachelor"=>7, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>5, "Professor"=>9}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>6, "Researcher"=>33, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>11, "Student > Postgraduate"=>4, "Other"=>4, "Student > Master"=>5, "Student > Bachelor"=>7, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>5, "Professor"=>9}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Engineering"=>1, "Environmental Science"=>4, "Nursing and Health Professions"=>1, "Agricultural and Biological Sciences"=>58, "Medicine and Dentistry"=>5, "Arts and Humanities"=>6, "Chemistry"=>1, "Social Sciences"=>2, "Computer Science"=>2, "Earth and Planetary Sciences"=>2, "Linguistics"=>4}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>5}, "Chemistry"=>{"Chemistry"=>1}, "Social Sciences"=>{"Social Sciences"=>2}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>58}, "Computer Science"=>{"Computer Science"=>2}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}, "Linguistics"=>{"Linguistics"=>4}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>4}, "Arts and Humanities"=>{"Arts and Humanities"=>6}}, "reader_count_by_country"=>{"Ecuador"=>1, "Colombia"=>1, "United States"=>5, "Philippines"=>1, "Egypt"=>1, "United Kingdom"=>3, "Switzerland"=>1, "Portugal"=>1, "Spain"=>2, "New Zealand"=>1, "Sweden"=>1, "Vietnam"=>1, "Brazil"=>1, "Mexico"=>1, "Nigeria"=>4, "Australia"=>1, "Chile"=>1, "Peru"=>1, "Germany"=>2}, "group_count"=>3}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/943947"], "description"=>"<p>A) The mean absolute impact of evolutionary papers for 39 journals from a range of different categories. The dotted line gives their overall impact. B) The impact of evolutionary articles relative to the impact of the average article for each of these journals. Relative impacts marked with an asterisk are significantly different from zero at the 5% level.</p>", "links"=>[], "tags"=>["evolutionary", "papers", "non-evolutionary"], "article_id"=>614344, "categories"=>["Evolutionary Biology", "Science Policy"], "users"=>["Erik Postma"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0000999.g001", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_impact_of_evolutionary_papers_in_evolutionary_and_non_evolutionary_journals_/614344", "title"=>"The impact of evolutionary papers in evolutionary and non-evolutionary journals.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 11:43:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/944056"], "description"=>"<p>To improve clarity, journals with a very low number of publications between 1996 and 2005 in any of the three sub-disciplines were excluded. As in <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0000999#pone-0000999-g001\" target=\"_blank\">Figure 1</a>, journals with black dots are classified as <i>Multidsciplinary Sciences</i>, journals with grey dots are classified under <i>Evolutionary Biology</i>, and journals classified under any other subject category are indicated with an open dot.</p>", "links"=>[], "tags"=>["ranking", "journals"], "article_id"=>614453, "categories"=>["Evolutionary Biology", "Science Policy"], "users"=>["Erik Postma"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0000999.g002", "stats"=>{"downloads"=>1, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_ranking_of_journals_across_sub_disciplines_/614453", "title"=>"The ranking of journals across (sub-) disciplines.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 11:44:09"}
  • {"files"=>["https://ndownloader.figshare.com/files/944149"], "description"=>"<p>As indicated by the significant Evolutionary vs. Overall impact × Journal interaction, the size and/or direction of the difference in impact between the evolutionary papers a journal publishes and its overall impact factor varies significantly among journals.</p>", "links"=>[], "tags"=>["evolutionary", "papers", "publishes"], "article_id"=>614540, "categories"=>["Evolutionary Biology", "Science Policy"], "users"=>["Erik Postma"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0000999.t001", "stats"=>{"downloads"=>0, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Differences_between_the_average_impact_of_the_evolutionary_papers_a_journal_publishes_and_its_overall_impact_factor_/614540", "title"=>"Differences between the average impact of the evolutionary papers a journal publishes and its overall impact factor.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-21 11:44:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/944168"], "description"=>"<p>There are significant differences among journals in the impact of articles on sexual selection and natural selection, but not on speciation, after accounting for differences in the impact of evolutionary articles as a whole. Most importantly, the size and direction of these differences varies across journals. To improve clarity, only within-journal effects are presented.</p>", "links"=>[], "tags"=>["articles", "evolutionary", "papers"], "article_id"=>614567, "categories"=>["Evolutionary Biology", "Science Policy"], "users"=>["Erik Postma"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0000999.t002", "stats"=>{"downloads"=>3, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Differences_in_the_impact_of_articles_on_A_sexual_selection_B_natural_selection_and_C_speciation_relative_to_the_impact_of_evolutionary_papers_as_a_whole_/614567", "title"=>"Differences in the impact of articles on A) sexual selection, B) natural selection, and C) speciation, relative to the impact of evolutionary papers as a whole.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-21 11:44:53"}

PMC Usage Stats | Further Information

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  • {"unique-ip"=>"9", "full-text"=>"6", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"2", "year"=>"2015", "month"=>"10"}
  • {"unique-ip"=>"2", "full-text"=>"1", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"7"}
  • {"unique-ip"=>"5", "full-text"=>"3", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"2", "year"=>"2014", "month"=>"8"}
  • {"unique-ip"=>"11", "full-text"=>"6", "pdf"=>"3", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"9"}
  • {"unique-ip"=>"6", "full-text"=>"5", "pdf"=>"3", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"10"}
  • {"unique-ip"=>"2", "full-text"=>"3", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"2"}
  • {"unique-ip"=>"5", "full-text"=>"5", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"11"}
  • {"unique-ip"=>"4", "full-text"=>"3", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"12"}
  • {"unique-ip"=>"10", "full-text"=>"9", "pdf"=>"2", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2015", "month"=>"1"}
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  • {"unique-ip"=>"5", "full-text"=>"1", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"1", "year"=>"2015", "month"=>"12"}
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  • {"unique-ip"=>"5", "full-text"=>"4", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"5"}
  • {"unique-ip"=>"6", "full-text"=>"5", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"6"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"7"}
  • {"unique-ip"=>"1", "full-text"=>"1", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"8"}
  • {"unique-ip"=>"3", "full-text"=>"3", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"9"}
  • {"unique-ip"=>"2", "full-text"=>"1", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"11"}
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  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"4"}
  • {"unique-ip"=>"26", "full-text"=>"46", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"5"}
  • {"unique-ip"=>"1", "full-text"=>"1", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"6"}
  • {"unique-ip"=>"2", "full-text"=>"3", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"7"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"8"}
  • {"unique-ip"=>"1", "full-text"=>"1", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"9"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"10"}
  • {"unique-ip"=>"5", "full-text"=>"4", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"11"}
  • {"unique-ip"=>"3", "full-text"=>"3", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"1"}
  • {"unique-ip"=>"4", "full-text"=>"6", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"3"}
  • {"unique-ip"=>"3", "full-text"=>"3", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"1", "year"=>"2019", "month"=>"1"}
  • {"unique-ip"=>"6", "full-text"=>"6", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"4"}
  • {"unique-ip"=>"12", "full-text"=>"11", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"5"}
  • {"unique-ip"=>"7", "full-text"=>"7", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"6"}
  • {"unique-ip"=>"4", "full-text"=>"4", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"7"}
  • {"unique-ip"=>"4", "full-text"=>"4", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"8"}
  • {"unique-ip"=>"4", "full-text"=>"5", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"10"}
  • {"unique-ip"=>"7", "full-text"=>"8", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"12"}
  • {"unique-ip"=>"6", "full-text"=>"6", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"9"}
  • {"unique-ip"=>"8", "full-text"=>"8", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"11"}
  • {"unique-ip"=>"7", "full-text"=>"7", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"2"}
  • {"unique-ip"=>"3", "full-text"=>"3", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"3"}
  • {"unique-ip"=>"1", "full-text"=>"1", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"4"}
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Relative Metric

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