Skip to main content

Research metrics

Bibliometric measures

The field of bibliometrics analyses publications through statistical methods. It uses citation data to provide insight into the impact of research outputs. Bibliometrics can be used in combination with qualitative indicators such as peer review, funding received, and the number of patents and awards granted.

You can use bibliometrics to:

  • analyse your research outputs
  • provide evidence of the impact of your research
  • find new and emerging areas of research
  • identify potential research collaborators
  • identify suitable sources in which to publish.

Sources of bibliometric data

Sources of journal information that enable publication and citation analysis include Web of Science, Scopus, SciVal, Google Scholar and Journal Citation Reports. You shouldn’t combine data from different sources to generate a specific metric as their coverage is different so they produce data differently. When you search for a specific researcher, make sure that you include all their possible name variations (this is made easier if the researcher has an ORCID identifier connecting their outputs). 

Some metrics are normalised. This aims to put citations into context. For example field weighted citation impact (FWCI) takes into account the differences in research behaviour across disciplines. FWCI of 1 means the output performs as expected for the global average. FWCI of more than 1 means the output is cited more than expected. For example 1.25 means cited 25% more than expected.

Any single metric will not provide a rounded overview of research performance. To practice responsible research metrics you will need to use a “basket of metrics”. Consider the context in which the metrics are used and look at them alongside appropriate qualitative measures.

Find out more by attending a bibliometrics webinar run by the Library’s Research Support team. 

Bibliometric measures

Here are some common bibliometric measures. Each metric has a link to more information about what it is and possible use-cases, from Elsevier’s Scival support hub and the website Metrics Toolkit:

  • Citation counts: the number of times a research output appears in the reference lists of other documents. Found in: Google Scholar, SciVal, Scopus and Web of Science
  • Citations per publication: the average number of citations received per publication. It can apply to an entity such as a researcher, a group of researchers, an entire institution. Found in: SciVal, 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 and Scopus
  • 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, SciVal, Scopus and Web of Science
  • Journal Impact Factor: based on the average number of citations received per paper in that journal during the preceding two years. Found in Journal Citation Reports
  • Outputs in top percentiles: the number or percentage of research outputs in the top most-cited publications in the world, UK, or a specific country. Found in SciVal and Scopus
  • Publication counts: Also known as scholarly output. The total number of outputs published by an entity. Found in: Google Scholar, SciVal, Scopus and Web of Science.