The impact factor or impact index measures the impact that a journal has had on scientific documentation through the analysis of the citations received by articles published in that journal.
It allows to compare journals, make rankings and reflect the relevance of each publication.
We can’t know the impact factor of an article, but we can know it of the magazine where it is published.
The impact factor comes from the division of the number of citations that have received the articles of a journal among the number of articles published. Some elements may vary (period of years or type of articles) and certain variables must be taken into account (short articles with many references, origin and thematic areas), the most widespread formula is:
F I 2002 = citations that have received articles published in 2000 and 2001 / Number of articles published in the period 2000-2001
Citations 2002 = 12 (2000) + 1 (2001) = 13
It is an indicator that serves to evaluate the relative importance of a journal within the total number of journals in its area.
If we divide the list of journals ordered from highest to lowest impact factor among 4, we will obtain 4 groups of journals; each set is a quartile. Thus, in the first quartile we find the journals with the highest impact factor.
To know in which quartile the magazine that we are interested in we can:
- Consult the JCR, click on the title of the journal, and then the Journal Ranking
- Consult In-RECS (the quartiles are indicated in the list)
Calculate by dividing the total number of journals in the list by 4, to find out how many titles each quartile will have.
You can find them by consulting the Web of Science, which includes the Sciences Citation Index (SCI), the Social Sciences Citation Index (SSCI) and the Arts and Humanities Citation Index (AHCI), where these data are extracted according to each specialty. You can search by author, title of the article or publication, affiliation, etc ...
You should bear in mind that Anglo-Saxon databases are often indexed by the second surname. To be found in the Web of Science it is very useful to join the surnames with a script and get used to signing the publications in the same way. We recommend you consult: the information related to ORCID
You can also use the Author Finder option that provides ISI and that allows you to select the different variants of the same name
Measures the speed with which a journal article is quoted and how often the articles of a journal are quoted in the same year. When the factor of immediacy is high, it means that the journal publishes leading articles on the subject.
It is calculated by dividing the number of citations received by the articles of a journal published in a year, by the number of articles published in the same year.
Check the Journal Citation Reports (JCR)
Jorge Hirsch, professor of physics at the University of California, published the article: An index to quantify an individual's scientific research output in which he proposed an indicator called Index h, based on the set of the most quoted works of the researcher and the number of citations of each of these works.
A researcher has an Index h of x when x of his documents have received at least x citations each. For example, a h = 20 means that an author has 20 publications that have each been quoted at least 20 times.
For example, a h = 20 means that an author teaches 20 publications that have been quoted at least 20 times each one.
PWe can find the index h in Wos and Google Scholar, among other databases.
It is a classification system for scientific journals in the fields of Social Sciences and Humanities that are published locally, nationally and internationally. This project, developed by AGAUR-Talència at the proposal of the General Directorate of Research, is presented with the aim of contributing to the evaluation of the research carried out in the Catalan scientific and university system with maximum objectivity.
C.I.R.C (Integrated Classification of Scientific Journals) aims to build a classification of scientific journals of social and human sciences according to their quality by integrating existing assessment products considered positive by the different national assessment agencies.
Searcher of scientific literature, especially in information technologies. It also calculates an impact index.
Indicator developed by the Index Foundation to assess the international impact of journals in the health field (nursery) and in countries and languages of Ibero-America.
Diffusion and Editorial Quality of the Spanish Journals of Humanities and Social and Legal Sciences. Prepared by the CINDOC, complementary to the RESH.
Developed by the Department of biology of the University of Washington. For each journal, it offers the Article Influence, which measures the prestige of the journal based on the citations received the last 5 years, and the Eigenfactor that measures the value of the articles published in a given year. It is included in the JCR.
European Reference Index for the Humanities. ERIH is an initiative of the European Science Foundation to evaluate humanities journals. Within each specialty, it classifies the journals into 3 categories that take into account the publication of the publication: INT1 category for international journals, INT2 category for journals with a more restricted scope and the NAT category for local journals.
Prepared by the ISI, gives the scope of citations by institution, country and journal.
Prepared by the López Piñeiro Institute for the History of Science and Documentation, the objective is to determine the impact factor of biomedical journals between 2001 and 2005.
Searcher of scientific literature developed by Google. For each document give the received citations and related articles.
Impact Index Spanish Journals of Social Sciences. Prepared by the EC3 Research Group on Evaluation of Science and Scientific Communication of the University of Granada. It indexes nearly 200 titles in the field of social sciences. Includes data from 1996 and is updated annually. (Since 2014 this resource is not updated)
Impression Index Spanish Journals of Legal Sciences. Prepared by the same IN-RECS group but for law journals. It indexes nearly 60 titles of law. Includes data from 2001 and is updated annually. (Since 2014 this resource is not updated)
List of scientific journals from Latin America, the Caribbean, Spain and Portugal selected and classified according to quality criteria established by the groups of specialists of the Latindex System. Gives full information about the magazine.
This is a free computer program that analyzes the citations of documents indexed by Google Scholar, it also offers the H index
It is an information system that integrates quality indicators for Spanish scientific journals of social sciences and humanities.
List of scientific journals that have successfully passed the evaluation process, thus obtaining the FECYT Quality Seal in recognition of their editorial and scientific quality.
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