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Measuring Research Impact

Types of Bibliometric/Research Impact Measures

Some types of Bibliometric Measures

  • Citation counts: the number of times a research output appears in the reference lists of other articles and books. Found in:  Scopus and Web of Science & Google Scholar.
  • H-index: designed to measure an author's productivity and impact. It is the number of an author’s publications (h) that have h or more citations to them. Found in: Google Scholar, Scopus and Web of Science.
  • Field-weighted citation impact: the ratio of citations received relative to the expected world average for the subject field, publication type and publication year. It can apply to a research output or group of research outputs. Found in SciVal.
  • Outputs in top percentiles: the number or percentage of research outputs in the top most-cited publications in the world, Ireland, or a specific country. Found in SciVal.
  • Journal Impact Factor: based on the average number of citations received per paper published in that journal in the preceding two years. Found in Journal Citation Reports.
  • CiteScore: the average number of citations received in a calendar year by all items published in that journal in the proceeding three years.
  • SCImago Journal Rank: places a higher value on citations from more prestigious journals.
  • Scopus SNIP: a ratio of a journal's citation count per paper and the citation potential in its subject field. The Scopus SNIP normalises citation rate subject differences. Found in Scopus
    • Sourced Leeds Universities Measuring Research Impact Guide (Adapted from the Metrics Toolkit licensed under a CC-BY 4.0 licence.)
    • For further information about the different metrics available please visit the Metrics Toolkit & the University of Waterloo guide here


Introduction to Bibliometrics with Niamh Brennan (Research Informatics, Trinity College)