Indicators of Scientometeritics


In most scientometric studies, the indicators are taken and inferred from the calculation and counting of the four variables of author, publication, citation and citation. The citation index is one of the most common and valid scientometric indices due to its relative attention to its quality and high efficiency in citation analysis. One of the most important scientometric indicators that have been formed based on the index of citation and citation analysis and have been mentioned many times in various texts, are:

H-Index: The h-index is defined as the maximum value of h such that the given author/journal has published at least h papers that have each been cited at least h times. The index is designed to improve upon simpler measures such as the total number of citations or publications. The index works best when comparing scholars working in the same field, since citation conventions differ widely among different fields

G-Index: The g-index is an author-level metric suggested in 2006 by Leo Egghe. The index is calculated based on the distribution of citations received by a given researcher's publications, such that given a set of articles ranked in decreasing order of the number of citations that they received, the g-index is the unique largest number such that the top g articles received together at least g2 citations. Hence, a g-index of 10 indicates that the top 10 publications of an author have been cited at least 100 times (102), a g-index of 20 indicates that the top 20 publications of an author have been cited 400 times (202).

M-Index: m-index is another variant of the h-index that displays h-index per year since first publication. The h-index tends to increase with career length, and m-index can be used in situations where this is a shortcoming, such as comparing researchers within a field but with very different career lengths. The m-index inherently assumes unbroken research activity since the first publication.

Y-Index: A bibliometric index called Y-index (j, h) is developed, taking the prominent first author and corresponding author positions into account for evaluation and comparison of scientific productivity. Y-index contained two parameters: publication performance j, which is related to publication quantity, and publication character h, which describes the proportion of corresponding author publications (RP) to first author publications (FP).

Journal Impact Factor-JIF: The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science. As a journal-level metric, it is frequently used as a proxy for the relative importance of a journal within its field; journals with higher impact factor values are given status of being more important, or carry more prestige in their respective fields, than those with lower values.

Mathew-Value: Matthew's value is an index that examines the visibility of a journal's articles over the past five years.

Immediacy Index: A measure of how topical and urgent work published in a scientific journal is. Along with the better known impact factor measure, it is a calculated each year by the Institute for Scientific Information (ISI) for those journals which it indexes; both impact factors and immediacy indices are published annually in the Journal Citation Reports.

Literature Obsolescence: (Cited Half-life) A measure developed by the Institute for Scientific Information (ISI) of the number of publication years from the current year which account for 50% of the current citations received by a journal.

Highly Cited Papers: Highly cited papers are the top one percent in each of the 22 ESI subject areas per year. They are based on the most recent 10 years of publications. Highly Cited Papers are considered to be indicators of scientific excellence and top performance and can be used to benchmark research performance against field baselines worldwide. Although Highly Cited Papers are synonymous with % Documents in the Top 1% in InCites, they are not the identical because of differences in subject scheme, time period and document type.

Hot Papers: A paper published in the past two years that received a number of citations in the most recent two-month period that places it in the top 0.1% of papers in the same field.