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CEU Library, Central European University

Scholarly Research Impact Metrics

Author Level Impact

h-index

The h-index is a metric that informs about the productivity and the impact of the published work. Calculate the h-index is relatively easy. h is the number of articles that have each been cited h number of times. 

This means an author with a h-index of 15 has published 15 articles that have each been cited at least 15 times.

Depending on the used data basis, the H index can differ. The databases of Google, SCOPUS and Web of Science are using different journals published in different time periods.

Let’s compare the h-index of cognitive scientist Gergely Csibra at Google Scholar, Scopus and Web of Science.

Google Scholar

Google Scholar example
Scopus

SCOPUS example


Web of Science

Web of Science example

Further reading:
J. E. Hirsch: An index to quantify an individual’s scientific research output. In: PNAS November 15, 2005 102 (46) 16569-16572

 

For using H-index as a metric, the following should be kept in mind:

  • Compared scientists should be from the same academic discipline.
  • The h-index depends on the stage of career of scientists.
  • The source for calculation should be recognized.
   
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