How does a researcher gauge the impact of his/her research? How do administrators objectively evaluate the performance of a researcher?
While both questions are difficult to answer, below are numeric measures that can provide a rough snapshot of impact.
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The number of citations to articles and books they’ve written provides a measurable indicator of an individual’s impact, providing a crude measure of how much their work is being used to advance the research of others. This raw count of citations will vary depending on what the data source includes, and it’s hard to compare for researchers in different fields and at different career stages. Citation counts can be found in:
- Web of Knowledge: A large interdisciplinary citation database that only reports the impact of those items indexed by their database.
- For tips on getting citation counts, such as removing self-citations, see Citation Research LibGuide: Web of Science.
- Scopus: Works like Web of Science. It searches a slightly different group of citations and will provide another sense of impact.
- Google Scholar: This huge, free database counts citations from both scholarly and non-scholarly sources.<?li>
- For tips on finding citations in it, see Citation Research LibGuide: Google Scholar.
- Some subject-specific databases now include citation counts, including SciFinder Scholar for chemistry and MathSciNet for mathematics.
Article Download Count
Some web platforms provide download counts for individual hosted publications. This activity measure indicates interest at that level, but because of non-uniform criteria, there is no standard way to aggregate counts from different systems. Examples of platforms that provide download counts include the University’s Digital Conservancy (via an item's Stats Display), and Public Library of Science (in an article's Metrics tab).
This measure aims to capture productivity as well as impact by counting how many of an author’s papers have been cited many times; to have an h-index of 5, five of a scholar’s publications must have been cited by others at least five times each. While more sophisticated than plain citation counts, the h-index shares the limitations of incomparability across fields and across career stages. An individual’s h-index may be found in
- Web of Knowledge, by generating a Citation Report for a specified author.
- Scopus, by searching for an author's name or clicking on a linked author name anywhere in the database, as described in this tip sheet.
- Google Scholar, after installing a tool such as the Google Scholar Universal Gadget, Publish or Perish software, or the Scholarometer add-on for Firefox or Chrome browsers.
Science Metrics, a Nature News special issue (6/16/10) discussing various individual productivity measures.
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