H-Index

The H-Index is one of the bibliometric indicator used in scientometric analysis, to analyze the diffusion models of scientific publications and to evaluate their impact on the reference scientific community.

Proposed in 2005 by the physicist Jorge E. Hirsch, it is internationally used to measure the individual performance of an author, in term of productivity and degree of incidence of its publications. The calculation is based on the number of publications and citations received: an author ha an H-Index equal to x, if x of his works have received at least x citations each (for example: an author has the H-Index = 8 if it produced 8 jobs that have been mentioned at least 8 times each).

For more information about it please click here (in Italian)

Impact Factor

The Impact Factor is a bibliometric indicator used to analyze models of distribution of publications and to assess their impact on the reference scientific community.

Processed in 1955 by the American chemist Eugene Garfield, founder in the 1961s of the Institute for Scientific Information-ISI (now owned by the pubisher Thomson Reuters), is internationally used to measure the performance of the scientific journals, of which quantifies the degree of incidence.

It should be considered in relation to the values ​​obtained by other periodicals used within the same scientific community (which is distinguished by a specific citation conduct).

It is calculated by relating:

• the number of citations received in the year by the articles published in the examinated magazine during the previous biennium
• the number of articles published by the examinated magazine during the previous biennium

How to calculate

Data of the Impact Factor are available (only for journals indexed since 1970) in the citation database Web of Science, and are searchable in the Journal citation reports (JCR).