The Web of Science uses the H-Index to quantify research output by measuring author productivity and impact.
H-Index = number of papers (h) with a citation number ≥ h.
Example: a scientist with an H-Index of 37 has 37 papers cited at least 37 times.
Advantages of the H-Index:
- Allows for direct comparisons within disciplines
- Measures quantity and impact by a single value.
Disadvantages of the H-Index:
- Does not give an accurate measure for early-career researchers
- Calculated by using only articles that are indexed in Web of Science. If a researcher publishes an article in a journal that is not indexed by Web of Science, the article as well as any citations to it will not be included in the H-Index calculation.
Tools for measuring H-Index:
- Web of Science
- Google Scholar
This short clip helps to explain the limitations of the H-Index for early-career scientists: