Bibliometrics
Journal Impact Factors (JIF) and H-indexes
JIFs in general
Journal Impact Factors (JIF) are relatively simple bibliometric parameters of journals, based on citations received by the journal during recent years, but they are quite important as a measure of the (relative) scientific status of a journal.
While many derivatives and alternatives exist (based on larger time windows or other databases like e.g. Google Scholar), the official JIFs were originally created by – and are still defined by – the Journal Citation Reports (JCR) published by Clarivate Analytics Web of Science (WoS). Although this database contains some 12,000 journals, many thousands of journals are not (yet) represented and thus do not feature an ‘official’ JIF.
Journal Citation Reports are published once a year, generally in June. Currently the most recent JIFs are those for the year 2022 (published in June 2023).
For more information on the uses and misuses of the JIF, see e.g. Schoonbaert D, Roelants G. Citation analysis for measuring the value of scientific publications: quality assessment tool or comedy of errors? Tropical Medicine and International Health 1996; 1: 739-752.
The Library & Information Science database contains thousands of references to JIFs and other bibliometric issues articles, the full text of which is available from the library.
JIFs at ITM
Click here to access the Journal Citation Reports. The Web of Science is not an open access database, but ITM does hold a paid subscription.
A list with the most current JIFs (currently relating to the year 2022) of some 700 journals that ITM staff have published in since 2005 can be found by clicking the button below.
H-indexes
The H-index (‘Hirsch’ index) is a relatively simple bibliometric parameter: it indicates the volume of more or less highly cited publications for a specific author. A H-index of 28 indicates that the author has published at least 28 articles that have each been cited at least 28 times within the Web of Science system.
As with the JIF, many variants exist, but the ‘official’ H-index needs to be based on the WoS data. Of course, H-indexes can also be calculated for groups of authors or for journals.
The Web of Science contains a handy Create Citation Report feature that automatically calculates a number of bibliometric parameters for your search results (e.g. articles by a specific author), including the H-index. Needless to say, this is a computer generated result that needs to be controlled manually for homonyms and other inaccuracies.