In the world of science, where the number of publications and citations plays a significant role, an objective tool is needed to evaluate a researcher's scientific contribution. The Hirsch index (h-index) is such a universal indicator. In today's article, we will explain how it is calculated.
What is the Hirsch index?
The Hirsch index is a quantitative indicator developed to assess the scientific productivity and influence of a scientist, a group of scientists, a scientific institution, etc. This index is an important tool for evaluating a scientist's contribution to the development of science. It was created by Argentine-American physicist Jorge Hirsch in 2005.
The Hirsch index takes into account a scientist's publications for the entire indexing period in a specific database. It can be found in prestigious databases such as Scopus, Web of Science, and others.
How to calculate the Hirsch Index?
The H-index is calculated based on the ratio of the number of a scientist's publications to their citation rate. The principle of calculating the Hirsch Index is as follows: the h-index is equal to the number h if a researcher has h publications, each of which has been cited at least h times. For example, if the h-index is 5, it means that the author has at least 5 publications, each of which has been cited at least 5 times. For better understanding, let's look at this example using a table:
| Article number | Number of citations |
| 1 | 8 |
| 2 | 8 |
| 3 | 7 |
| 4 | 6 |
| 5 | 5 |
| 6 | 4 |
To calculate the h-index, you first need to arrange the articles in descending order by number of citations. Then you need to find the largest number h that satisfies the condition: the author has at least h publications, each of which has been cited at least h times. This value is the author's Hirsch index. The sixth article violates this condition, since the article number is 6 and the number of citations is less than 6. Therefore, the sixth article is not taken into account in the calculation, and the fifth is the Hirsch index.
Advantages of a high h-index for scientists
The h-index shows the relevance and significance of an author's research and opens up new career opportunities. It is used for the following purposes:
- It is one of the key criteria for obtaining grants, scholarships and funding for scientific research.
- It serves as an important indicator for employers when making employment decisions.
- In some educational institutions, the h-index is a criterion that is taken into account when evaluating candidates for teaching positions (professor, associate professor, etc.).
- It promotes international cooperation.
- It increases the researcher's authority in the scientific community.
The Hirsch index is an important indicator for evaluating a scientist's research activity. It is important for every scientist to increase their Hirsch index, as it opens up many career opportunities and has a positive impact on professional development.
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