H-index [Neurosurgery Wiki]

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====== H-index ======


The h-index (Hirsch index) is a [[metric]] that quantifies both the [[productivity]] and [[impact]] of a [[researcher]]'s scientific [[work]]. It was proposed by physicist Jorge E. Hirsch in 2005 as a tool for evaluating the cumulative impact of a researcher's publications. The h-index is widely used in academia and research institutions for assessing the significance and influence of a researcher's contributions.

Here's how the h-index is calculated:

Arrange a researcher's publications in descending order based on the number of citations each publication has received.

The h-index is the highest number 
ℎ
h for which 
ℎ
h publications have at least 
ℎ
h citations each. In simpler terms, if a researcher has an h-index of 20, it means they have published 20 papers, each of which has been cited at least 20 times.

For example, if a researcher has an h-index of 20, it implies that they have 20 papers, each of which has been cited at least 20 times.

The h-index is intended to provide a more comprehensive measure of a researcher's impact than simple citation counts or other metrics. It considers both the quantity (number of publications) and quality (citation impact) of a researcher's work.

===== Limitations =====

While the h-index is widely used, it is not without [[limitation]]s. It may not be a perfect measure of a [[researcher]]'s overall [[impact]], as it does not consider the context of the field or the differences in [[citation]] practices among [[discipline]]s. Additionally, it may not be as informative for early-career researchers or those in rapidly evolving fields.
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[[Coauthor]]s receiving equal credit in an article; not taking into consideration journal impact factors and document types;
and difficulty in distinguishing research [[achievement]]s within and between groups due to the use of an integer value
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===== Variations =====

Other variations of the h-index exist, such as the g-index and the i10-index, each with its own methodology for evaluating the impact of researchers. Despite its limitations, the h-index remains a commonly used tool for assessing and comparing the scholarly impact of researchers within and across disciplines.
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[[Publication metrics]] such as the [[Hirsch index]] ([[h-index]]) are often used to evaluate and compare [[research]] [[productivity]] in academia. The h-index is not a field-normalized statistic and can, therefore, be dependent on overall rates of [[publication]] and [[citation]] within specific fields. Thus, a metric that adjusts for this while measuring individual contributions would be preferable.

The [[National Institutes of Health]] ([[NIH]]) developed a field-normalized, article-level metric called the "[[relative citation ratio]]" (RCR) that can be used to more accurately compare [[author]] productivity between fields. The mean RCR is calculated as the total number of citations per year of a publication divided by the average field-specific citations per year, whereas the weighted RCR is the sum of all article-level RCR scores over an author's career
((Reddy V, Gupta A, White MD, Gupta R, Agarwal P, Prabhu AV, Lieber B, Chang YF,
Agarwal N. Assessment of the NIH-supported relative citation ratio as a measure
of research productivity among 1687 academic neurological surgeons. J Neurosurg. 
2020 Jan 31:1-8. doi: 10.3171/2019.11.JNS192679. [Epub ahead of print] PubMed
PMID: 32005024.
)).
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Daniels et al. found that [[publication]] count and [[h-index]] during [[residency]] correlated to an academic career, but not publication count prior to residency
((Daniels M, Garzon-Muvdi T, Maxwell R, et al. Preresidency publication
number does not predict academic career placement in neurosurgery.
[Epub ahead of print Feb 16 2017] World Neurosurg. 2017;101:350-356.
doi: 10.1016/j.wneu.2017.02.028.)).

The h-index is an [[index]] that attempts to measure both the [[productivity]] and impact of the published work of a scientist or scholar. 

The index is based on the set of the scientist's most cited [[paper]]s and the number of citations that they have received in other publications. The index can also be applied to the productivity and impact of a group of scientists, such as a department or university or country, as well as a scholarly journal. The index was suggested in [[2005]] by Jorge E. Hirsch, a physicist at UCSD, as a tool for determining theoretical physicists' relative quality and is sometimes called the Hirsch index or Hirsch number.

Various [[bibliometrics#Bibliometric indices]] based on the citations accumulated by scholarly articles, including the h-index...
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Application of the h-index to Kingdom of Saudi Arabia (KSA) neurosurgeons revealed a significant correlation with the duration after certification and with certain centers. Evaluation of the h-index should be included in the consideration for academic positions in KSA. Saudi neurosurgeons should be encouraged to publish in journals with high [[impact factor]]
((Jamjoom AB. Survey of h-index for neurosurgeons in Saudi Arabia. Neurosciences
(Riyadh). 2015 Oct;20(4):392-395. doi: 10.17712/nsj.2015.4.20140735. PubMed PMID:
26492123.
)).

===== H5-Index =====

see [[H5-Index]]

===== References =====