Evaluating a researcher's scientific activity is an important step in determining their authority, scientific productivity, and role in the academic community. One of the most common and effective tools for this is the Hirsch index (h-index). Why has this indicator become so popular? How is the h-index calculated? What are its advantages and limitations? In this article, we will answer these questions.
Briefly about the H-index
Hirsch index (h-index) – is a special indicator that helps to assess how actively a scientist's publications are cited in other scientific works. In other words, it is a numerical value that reflects the number of publications by a researcher (h), each of which has at least h citations. For example, if a scientist has an H-index of 10, it means that they have 10 publications, each of which has been cited at least 10 times.
This indicator was created to balance the number of publications (i.e., the scientist's productivity) and their impact in the academic community (citations), providing a single number that characterises the researcher's scientific contribution.
How is the H-index calculated?
Although the Hirsch index allows for a comprehensive analysis of a scientist's activity, it is quite simple to calculate. All you need is data on the number of publications and their citations. Conventionally, this process can be divided into three stages, namely:
- Data collection. At this stage, it is necessary to compile a list of all publications and the number of citations for each of them. This data is usually obtained from scientometric databases such as Scopus, Web of Science or Google Scholar.
- Sorting. The next step is to sort the publications by the number of citations in descending order.
- Determining the H-index. Finally, you need to find the maximum number h for which at least h publications have h or more citations.
To better understand the sequence of calculations, let's look at an example. Suppose you have 5 publications with the following number of citations: 25, 15, 10, 5, 2. First, we compile a list as shown below.
- The first publication (25 citations) has more than 1 citation.
- The second publication (15 citations) has more than 2 citations.
- The third publication (10 citations) has more than 3 citations.
- The fourth publication (5 citations) has more than 4 citations.
- The fifth publication (2 citations) has no more than 5 citations.
Since only 4 of all publications have at least 4 citations, the H-index is 4.
What are the advantages and disadvantages of the H-index?
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Advantages |
Disadvantages |
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Simplicity: Easy to understand and calculate, making it convenient for comparing scientists. |
Ignoring the context of citations: The indicator does not distinguish between positive, negative, or self-citations, which in turn can distort the results. |
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Balance between quantity and quality: The indicator takes into account both the number of publications and their impact. |
Dependence on discipline: Varies greatly between scientific fields. In the natural sciences, the average H-index is usually higher than in the humanities due to differences in citation norms. |
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Versatility: Used to analyse the activities of individual researchers, groups, journals, or even entire institutions, allowing for the evaluation of different levels of scientific activity. |
Limitations on high values: after a certain level, it is difficult to increase the index, as this requires new publications with numerous citations. |
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Resistance to isolated high results: a researcher who has only one such article and a number of less-cited articles will not receive a high index value. |
What is the Hirsch index used for?
First of all, the Hirsch index plays an important role in the process of appointing scientific positions, awarding scientific degrees, obtaining grants or participating in competitions. For example, when selecting candidates for scholarships or teaching positions, the h-index allows you to quickly assess the influence of their scientific activity. It is also useful for comparing researchers within the same discipline, where publication and citation conditions are similar.
In addition to evaluating individual authors, the h-index is used to analyse the effectiveness of scientific institutions or research groups. Universities and research centres use this indicator for ranking, internal monitoring, or strategic planning.
Despite certain limitations, the Hirsch index remains one of the most popular tools for quick and objective evaluation of scientific activity.
If you want to increase your h-index but don't know how to do it, contact Scientific Publications. Our team of specialists will analyse your scientific profile and develop an individual strategy to increase this indicator. Would you like to receive a free consultation? Then fill out the form below, and our manager will contact you shortly. Together to new scientific achievements!
