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73-548: Psychological Reports is abstracted and indexed in the Social Sciences Citation Index and MEDLINE . As of 2024, the journal's impact factor was 2.3, and it was ranked 75th out of 147 journals in the category "Psychology, Multidisciplinary." This article about an academic journal on psychology is a stub . You can help Misplaced Pages by expanding it . See tips for writing articles about academic journals . Further suggestions might be found on

146-486: A bi-component of 28 journals. The two composing substructures of library and information science have remained visible in this representation." He also notes in a separate study of the Journal Citation Reports SCI and SSCI merger, that if a journal is potentially marginal in one context, the addition of the other "can provide interesting perspectives on its position in the field and its function in

219-575: A citation index. Using a variety of quantitative techniques Dragan Ivanović and Yuh-Shan Ho to elaborate on an understanding on the direction of the Information Science and Library Science fields within the SSCI. They documented a number of trends and patterns such as: Impact factor The impact factor ( IF ) or journal impact factor ( JIF ) of an academic journal is a scientometric index calculated by Clarivate that reflects

292-518: A different perspective on research impact, concentrating more on immediate social impact in and outside academia. Fake impact factors or bogus impact factors are produced by certain companies or individuals. According to an article published in the Electronic Physician , these include Global Impact Factor, Citefactor, and Universal Impact Factor. Jeffrey Beall maintained a list of such misleading metrics. Another deceitful practice

365-433: A good technique for scientific evaluation. Experience has shown that in each specialty the best journals are those in which it is most difficult to have an article accepted, and these are the journals that have a high impact factor. Most of these journals existed long before the impact factor was devised. The use of impact factor as a measure of quality is widespread because it fits well with the opinion we have in each field of

438-519: A larger percentage of review articles which generally are cited more than research reports. Research undertaken in 2020 on dentistry journals concluded that the publication of "systematic reviews have significant effect on the Journal Impact Factor ... while papers publishing clinical trials bear no influence on this factor. Greater yearly average of published papers ... means a higher impact factor." Journals may also attempt to limit

511-521: A mixture of metrics on their website; the PLOS series of journals does not display the impact factor. Microsoft Academic took a similar view, stating that h-index, EI/SCI and journal impact factors are not shown because "the research literature has provided abundant evidence that these metrics are at best a rough approximation of research impact and scholarly influence." In 2021, Utrecht University promised to abandon all quantitative bibliometrics, including

584-429: A narrow focus on publishing in top-tier journals, potentially compromising the diversity of research topics and methodologies. Further criticisms argue that emphasis on impact factor results from the negative influence of neoliberal politics on academia. Some of these arguments demand not just replacement of the impact factor with more sophisticated metrics but also discussion on the social value of research assessment and

657-1414: A new corporation, Clarivate, which is now the publisher of the JCR. In any given year, the two-year journal impact factor is the ratio between the number of citations received in that year for publications in that journal that were published in the two preceding years and the total number of "citable items" published in that journal during the two preceding years: IF y = Citations y Publications y − 1 + Publications y − 2 . {\displaystyle {\text{IF}}_{y}={\frac {{\text{Citations}}_{y}}{{\text{Publications}}_{y-1}+{\text{Publications}}_{y-2}}}.} For example, Nature had an impact factor of 41.577 in 2017: IF 2017 = Citations 2017 Publications 2016 + Publications 2015 = 74090 880 + 902 = 41.577. {\displaystyle {\text{IF}}_{2017}={\frac {{\text{Citations}}_{2017}}{{\text{Publications}}_{2016}+{\text{Publications}}_{2015}}}={\frac {74090}{880+902}}=41.577.} This means that, on average, its papers published in 2015 and 2016 received roughly 42 citations each in 2017. 2017 impact factors are reported in 2018; they cannot be calculated until all of

730-431: A protest against the "absurd scientific situation in some countries" related to use of the impact factor. The large number of citations meant that the impact factor for that journal increased to 1.44. As a result of the increase, the journal was not included in the 2008 and 2009 Journal Citation Reports . Coercive citation is a practice in which an editor forces an author to add extraneous citations to an article before

803-506: A range of useful search functions such as 'cited reference searching', searching by author, subject, or title. Whilst the Social Sciences Citation Index provides extensive support in bibliographic analytics and research, a number of academic scholars have expressed criticisms relating to ideological bias and its English-dominant publishing nature. The SSCI citation database covers some 3,400 academic journals in

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876-522: A scientific paper without seeing the primary data, so should they not rely on Thomson Scientific's impact factor, which is based on hidden data". However, a 2019 article demonstrated that "with access to the data and careful cleaning, the JIF can be reproduced", although this required much labour to achieve. A 2020 research paper went further. It indicated that by querying open access or partly open-access databases, like Google Scholar, ResearchGate, and Scopus, it

949-458: Is "a wide variation [of citations] from article to article within a single journal". Despite this warning, the use of the JIF has evolved, playing a key role in the process of assessing individual researchers, their job applications and their funding proposals. In 2005, The Journal of Cell Biology noted that: Impact factor data ... have a strong influence on the scientific community, affecting decisions on where to publish, whom to promote or hire,

1022-614: Is accessible to all registered users, who can independently verify the number of citable items for a given journal. In contrast, the number of citations is extracted not from the WoS database, but from a dedicated JCR database, which is not accessible to general readers. Hence, the commonly used "JCR Impact Factor" is a proprietary value, which is defined and calculated by ISI and can not be verified by external users. New journals, which are indexed from their first published issue, will receive an impact factor after two years of indexing; in this case,

1095-408: Is possible to calculate approximate impact factors without the need to purchase Web of Science / JCR. Just as the impact factor has attracted criticism for various immediate problems associated with its application, so has there also been criticism that its application undermines the broader process of science. Research has indicated that bibliometrics figures, particularly the impact factor, decrease

1168-570: Is well established that social democratic sensibilities dominate the social sciences and humanities." They concluded the Social Science Citation Index has quite a clear ideological bias towards 'Social Democratic' articles, however the opposite could be argued due to the lopsided number of social democratic journals. Citation count in academic work is commonly associated with quality of research whilst some researchers suggest it merely reflects influence and visibility within

1241-462: The Institute for Scientific Information and subsequently owned by Clarivate in 2017. Philip Altbach has criticized the Social Sciences Citation Index of favoring English-language journals generally and American journals specifically, while greatly under-representing journals in non-English languages. Academics such as June Yichun Liu have expressed similar criticisms stating only two percent of

1314-771: The San Francisco Declaration on Research Assessment (DORA). Released in May 2013, DORA has garnered support from thousands of individuals and hundreds of institutions, including in March 2015 the League of European Research Universities (a consortium of 21 of the most renowned research universities in Europe), who have endorsed the document on the DORA website. Publishers, even those with high impact factors, also recognised

1387-519: The h-index and the impact factor". The UK's Research Assessment Exercise for 2014 also banned the journal impact factor although evidence suggested that this ban was often ignored. In response to growing concerns over the inappropriate use of journal impact factors in evaluating scientific outputs and scientists themselves, the American Society for Cell Biology together with a group of editors and publishers of scholarly journals created

1460-468: The median of these data. There is also a more general debate on the validity of the impact factor as a measure of journal importance and the effect of policies that editors may adopt to boost their impact factor (perhaps to the detriment of readers and writers). Other criticism focuses on the effect of the impact factor on behavior of scholars, editors and other stakeholders. Criticism of impact factors also extends to its impact on researcher behavior. While

1533-513: The social sciences across more than 50 disciplines . It is made available online through the Web of Science service for a fee. The database records which articles are cited by other articles and aids in many bibliographic analytics. The Master Journal List provides users with the ability to search for journals that have been indexed through a simple user interface that allows users to search by author, title or citation. The Social Science Citation Index

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1606-575: The 2017 publications have been processed by the indexing agency. The value of impact factor depends on how to define "citations" and "publications"; the latter are often referred to as "citable items". In current practice, both "citations" and "publications" are defined exclusively by ISI as follows. "Publications" are items that are classed as "article", "review" or "proceedings paper" in the Web of Science (WoS) database; other items like editorials, corrections, notes, retractions and discussions are excluded. WoS

1679-641: The Conduct of Science issued a "statement on publication practices and indices and the role of peer review in research assessment", suggesting many possible solutions—e.g., considering a limit number of publications per year to be taken into consideration for each scientist, or even penalising scientists for an excessive number of publications per year—e.g., more than 20. In February 2010, the Deutsche Forschungsgemeinschaft (German Research Foundation) published new guidelines to reduce

1752-411: The JIF as part of such review, promotion, and tenure processes. And a 2017 study of how researchers in the life sciences behave concluded that "everyday decision-making practices as highly governed by pressures to publish in high-impact journals". The deeply embedded nature of such indicators not only effect research assessment, but the more fundamental issue of what research is actually undertaken: "Given

1825-461: The JIF is still useful, and that omitting it "will lead to randomness and a compromising of scientific quality". Some related metrics, also calculated and published by the same organization, include: A given journal may attain a different quartile or percentile in different categories. As with the impact factor, there are some nuances to this: for example, Clarivate excludes certain article types (such as news items, correspondence, and errata) from

1898-497: The JIF state that use of the arithmetic mean in its calculation is problematic because the pattern of citation distribution is skewed and citation distributions metrics have been proposed as an alternative to impact factors. However, there have also been pleas to take a more nuanced approach to judging the distribution skewness of the impact factor. Ludo Waltman and Vincent Antonio Traag, in their 2021 paper, ran numerous simulations and concluded that "statistical objections against

1971-544: The JIF to cultivate a competition regime in academia has been shown to have deleterious effects on research quality. A number of regional and international initiatives are now providing and suggesting alternative research assessment systems, including key documents such as the Leiden Manifesto and the San Francisco Declaration on Research Assessment (DORA). Plan S calls for a broader adoption and implementation of such initiatives alongside fundamental changes in

2044-476: The SSCI academic publications come from developing nations thereby creating an artificial importance in countries such as Taiwan. This artificial importance in Taiwan deems all scholarly work published in the SSCI as canonical and most other work immaterial thus affecting scholarships and funding of other scholarly research. Liu suggests this will have some influence in research undertaken by scholars vastly affecting

2117-404: The Social Science Citation Index is classed as a potential hazardous outcome by several scholars such as Eric Chiang and Daniel Klein . Aspects of the Social Science Citation Index have been rigorously studied for Ideological bias, with evidence being found, however not conclusive. During the year 2003, using a criterion of consistency and outspokenness, Chiang and Klein analysed under a quarter of

2190-593: The United States was listed as the address in over half the indexed articles within the SSCI, however they note the number of academics publishing Social Science research is perhaps the determining variable. This suggests the English-dominant nature of the SSCI affects the number of Non-English articles and also their impact factor . Comparing Turkish articles average citations with other non-English countries, Olpak and Arican found Turkey's average count

2263-399: The aforementioned academics, there are opposing views on different aspects of the SSCI. Drawing a stark contrast to the social science subset, the field of information science has been stabilized under the subset labelled ' library and information science ' over the course of the past two decades. He notes "The relevant set of journals is visible in 2001 both as a factor with 35 journals and as

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2336-411: The article's talk page . This article about a psychiatry journal is a stub . You can help Misplaced Pages by expanding it . See tips for writing articles about academic journals . Further suggestions might be found on the article's talk page . Social Sciences Citation Index The Social Sciences Citation Index ( SSCI ) is a commercial citation index product of Clarivate Analytics . It

2409-401: The available 1,768 articles published for ideological bias. They clarified their criterion of consistency and outspokenness for republican articles as "an organization is orientated toward a particular ideology if, relative to the norm, it dwells on, expresses, or espouses the sensibilities of that ideology". They do, however, discuss the importance of the benchmark of the 'norm' as they note "it

2482-424: The best journals in our specialty....In conclusion, prestigious journals publish papers of high level. Therefore, their impact factor is high, and not the contrary. As impact factors are a journal-level metric, rather than an article- or individual-level metric, this use is controversial. Eugene Garfield, the inventor of the JIF agreed with Hoeffel, but warned about the "misuse in evaluating individuals" because there

2555-605: The boundaries of economics is less likely to be published in prominent journals thereby inappropriately evaluating scholarly productivity relative to the orientation of the discipline. It is also worth noting upon analysing the Journal Citation reports analytics relating to the Social Science Citation Index and Science Citation Index , Loet Leydesdorff expressed difficulty in analysis correlations between disciplines in social sciences in comparison with natural sciences for numerous reasons including methodology. Loet expresses

2628-536: The calendar year. This gives those papers more time to gather citations. Several methods, not necessarily with nefarious intent, exist for a journal to cite articles in the same journal which will increase the journal's impact factor. Beyond editorial policies that may skew the impact factor, journals can take overt steps to game the system . For example, in 2007, the specialist journal Folia Phoniatrica et Logopaedica , with an impact factor of 0.66, published an editorial that cited all its articles from 2005 to 2006 in

2701-808: The case of the article "A short history of SHELX", which included this sentence: "This paper could serve as a general literature citation when one or more of the open-source SHELX programs (and the Bruker AXS version SHELXTL) are employed in the course of a crystal-structure determination". This article received more than 6,600 citations. As a consequence, the impact factor of the journal Acta Crystallographica Section A rose from 2.051 in 2008 to 49.926 in 2009, more than Nature (at 31.434) and Science (at 28.103). The second-most cited article in Acta Crystallographica Section ;A in 2008 had only 28 citations. Critics of

2774-546: The citations to the year prior to volume 1, and the number of articles published in the year prior to volume 1, are known zero values. Journals that are indexed starting with a volume other than the first volume will not get an impact factor until they have been indexed for three years. Occasionally, Journal Citation Reports assigns an impact factor to new journals with less than two years of indexing, based on partial citation data. The calculation always uses two complete and known years of item counts, but for new titles one of

2847-509: The current ways of evaluation and valuing research, risky, lengthy, and unorthodox project rarely take center stage." Numerous critiques have been made regarding the use of impact factors, both in terms of its statistical validity and also of its implications for how science is carried out and assessed. A 2007 study noted that the most fundamental flaw is that impact factors present the mean of data that are not normally distributed , and suggested that it would be more appropriate to present

2920-696: The denominator. Additional journal-level metrics are available from other organizations. For example, CiteScore is a metric for serial titles in Scopus launched in December 2016 by Elsevier . While these metrics apply only to journals, there are also author-level metrics , such as the h-index , that apply to individual researchers. In addition, article-level metrics measure impact at an article level instead of journal level. Other more general alternative metrics, or " altmetrics ", that include article views, downloads, or mentions in social media , offer

2993-552: The denominator. One notorious example of this occurred in 1988 when it was decided that meeting abstracts published in FASEB Journal would no longer be included in the denominator. The journal's impact factor jumped from 0.24 in 1988 to 18.3 in 1989. Publishers routinely discuss with Clarivate how to improve the "accuracy" of their journals' impact factor and therefore get higher scores. Such discussions routinely produce "negotiated values" which result in dramatic changes in

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3066-400: The emphasis on high-impact journals may lead to strategic publishing practices that prioritize journal prestige over the quality and relevance of research, it's important to acknowledge the "privilege paradox". Younger researchers, particularly those from under-represented regions, often lack the established reputation or networks to secure recognition outside of these metrics. This can lead to

3139-424: The flaws. Nature magazine criticised the over-reliance on JIF, pointing not just to its statistical flaws but to negative effects on science: "The resulting pressures and disappointments are nothing but demoralizing, and in badly run labs can encourage sloppy research that, for example, fails to test assumptions thoroughly or to take all the data into account before submitting big claims." Various publishers now use

3212-421: The following regarding methodology, "Unlike the natural and life sciences, the social sciences often construct their subject matter both in terms of 'what' they study and in terms of 'how' the subject under study is to be analyzed." Leydesdorff also noted the developments in specialty clusters are small, recognition on an international scale is limited but also volatile. Whilst there are some criticisms drawn from

3285-457: The growing precariousness of scientific careers in higher education. It has been stated that impact factors in particular and citation analysis in general are affected by field-dependent factors which invalidate comparisons not only across disciplines but even within different fields of research of one discipline. The percentage of total citations occurring in the first two years after publication also varies highly among disciplines from 1–3% in

3358-531: The impact factor. The university stated that "it has become a very sick model that goes beyond what is really relevant for science and putting science forward". This followed a 2018 decision by the main Dutch funding body for research, NWO , to remove all references to journal impact factors and the h-index in all call texts and application forms. Utrecht's decision met with some resistance. An open letter signed by over 150 Dutch academics argued that, while imperfect,

3431-635: The institutional level. It thus has significant impact on steering research practices and behaviours. By 2010, national and international research funding institutions were already starting to point out that numerical indicators such as the JIF should not be considered as a measure of quality. In fact, research was indicating that the JIF is a highly manipulated metric, and the justification for its continued widespread use beyond its original narrow purpose seems due to its simplicity (easily calculable and comparable number), rather than any actual relationship to research quality. Empirical evidence shows that

3504-623: The journal impact factor. In November 2007 the European Association of Science Editors (EASE) issued an official statement recommending "that journal impact factors are used only—and cautiously—for measuring and comparing the influence of entire journals, but not for the assessment of single papers, and certainly not for the assessment of researchers or research programmes". In July 2008, the International Council for Science Committee on Freedom and Responsibility in

3577-418: The journal will agree to publish it, in order to inflate the journal's impact factor. A survey published in 2012 indicates that coercive citation has been experienced by one in five researchers working in economics, sociology, psychology, and multiple business disciplines, and it is more common in business and in journals with a lower impact factor. Editors of leading business journals banded together to disavow

3650-450: The known counts is zero. Annuals and other irregular publications sometimes publish no items in a particular year, affecting the count. The impact factor relates to a specific time period; it is possible to calculate it for any desired period. For example, the JCR also includes a five-year impact factor , which is calculated by dividing the number of citations to the journal in a given year by the number of articles published in that journal in

3723-409: The marginalization of research in vernacular languages and on locally relevant topics and inducement to unethical authorship and citation practices. More generally, the impact factors fosters a reputation economy, where scientific success is based on publishing in prestigious journals ahead of actual research qualities such as rigorous methods, replicability and social impact. Using journal prestige and

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3796-647: The mathematical and physical sciences to 5–8% in the biological sciences. Thus impact factors cannot be used to compare journals across disciplines. Impact factors are sometimes used to evaluate not only the journals but the papers therein, thereby devaluing papers in certain subjects. In 2004, the Higher Education Funding Council for England was urged by the House of Commons Science and Technology Select Committee to remind Research Assessment Exercise panels that they are obliged to assess

3869-509: The misuse of the JIF—and journal ranking metrics in general—has a number of negative consequences for the scholarly communication system. These include gaps between the reach of a journal and the quality of its individual papers and insufficient coverage of social sciences and humanities as well as research outputs from across Latin America, Africa, and South-East Asia. Additional drawbacks include

3942-453: The network." Implemented within the library and information science is institutional repositories ; however, this is the only subset in which they are listed which has practical implications for academics as noted by Yi-Ping Liao and Tsu-Jui Ma. It is not, however, without its solutions, if implemented in other subsets of the SSCI, Liao and Ma suggest this will help further academic research in future. The potential for ideological bias within

4015-599: The number of "citable items"—i.e., the denominator of the impact factor equation—either by declining to publish articles that are unlikely to be cited (such as case reports in medical journals) or by altering articles (e.g., by not allowing an abstract or bibliography in hopes that Journal Citation Reports will not deem it a "citable item"). As a result of negotiations over whether items are "citable", impact factor variations of more than 300% have been observed. Items considered to be uncitable—and thus are not incorporated in impact factor calculations—can, if cited, still enter into

4088-427: The number of publications that could be submitted when applying for funding: "The focus has not been on what research someone has done but rather how many papers have been published and where." They noted that for decisions concerning "performance-based funding allocations, postdoctoral qualifications, appointments, or reviewing funding proposals, [where] increasing importance has been given to numerical indicators such as

4161-444: The numerator part of the equation despite the ease with which such citations could be excluded. This effect is hard to evaluate, for the distinction between editorial comment and short original articles is not always obvious. For example, letters to the editor may be part of either class. Another less insidious tactic journals employ is to publish a large portion of its papers, or at least the papers expected to be highly cited, early in

4234-428: The observed scores for dozens of journals, sometimes after unrelated events like the purchase by one of the larger publishers. Because citation counts have highly skewed distributions , the mean number of citations is potentially misleading if used to gauge the typical impact of articles in the journal rather than the overall impact of the journal itself. For example, about 90% of Nature ' s 2004 impact factor

4307-510: The practice. However, cases of coercive citation have occasionally been reported for other disciplines. The journal impact factor was originally designed by Eugene Garfield as a metric to help librarians make decisions about which journals were worth indexing, as the JIF aggregates the number of citations to articles published in each journal. Since then, the JIF has become associated as a mark of journal "quality", and gained widespread use for evaluation of research and researchers instead, even at

4380-448: The previous five years. While originally invented as a tool to help university librarians to decide which journals to purchase, the impact factor soon became used as a measure for judging academic success. This use of impact factors was summarised by Hoeffel in 1998: Impact Factor is not a perfect tool to measure the quality of articles but there is nothing better and it has the advantage of already being in existence and is, therefore,

4453-424: The process of publication and science is slowed down – authors automatically try and publish with the journals with the highest impact factor – "as editors and reviewers are tasked with reviewing papers that are not submitted to the most appropriate venues". Given the growing criticism and its widespread usage as a means of research assessment, organisations and institutions have begun to take steps to move away from

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4526-401: The quality of peer review an article receives, cause a reluctance to share data, decrease the quality of articles, and a reduce the scope in of publishable research. "For many researchers the only research questions and projects that appear viable are those that can meet the demand of scoring well in terms of metric performance indicators – and chiefly the journal impact factor.". Furthermore,

4599-515: The quality of the content of individual articles, not the reputation of the journal in which they are published. Other studies have repeatedly stated that impact factor is a metric for journals and should not be used to assess individual researchers or institutions. Because impact factor is commonly accepted as a proxy for research quality, some journals adopt editorial policies and practices, some acceptable and some of dubious purpose, to increase its impact factor. For example, journals may publish

4672-563: The scholarly communication system. As appropriate measures of quality for authors and research, concepts of research excellence should be remodelled around transparent workflows and accessible research results. JIFs are still regularly used to evaluate research in many countries, which is a problem since a number of issues remain around the opacity of the metric and the fact that it is often negotiated by publishers. Results of an impact factor can change dramatically depending on which items are considered as "citable" and therefore included in

4745-516: The success of grant applications, and even salary bonuses. More targeted research has begun to provide firm evidence of how deeply the impact factor is embedded within formal and informal research assessment processes. A review in 2019 studied how often the JIF featured in documents related to the review, promotion, and tenure of scientists in US and Canadian universities. It concluded that 40% of universities focused on academic research specifically mentioned

4818-531: The types of subjects of research, ultimately limiting the scope of academic work. Similar to criticisms leveled by Liu and Altbach, Yusuf Ziya Olpak and Muhammet Arican found that only 2.138% of the total SSCI indexed articles published expressed a variable related to Turkey such as research area or authors address. They also found only three articles as highly cited (0.707%) suggesting a poor representation of Turkish academic literature and Turkish-addressed articles. In contrast to minute representation, they found that

4891-459: The use of the IF at the level of individual articles are not convincing", and that "the IF may be a more accurate indicator of the value of an article than the number of citations of the article". While the underlying mathematical model is publicly known, the dataset which is used to calculate the JIF is not publicly available. This prompted criticism: "Just as scientists would not accept the findings in

4964-633: 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 the status of being more important, or carry more prestige in their respective fields, than those with lower values. While frequently used by universities and funding bodies to decide on promotion and research proposals, it has been criticised for distorting good scientific practices. The impact factor

5037-465: Was 6.653, Taiwan's was 17.35, Germany was 17.29 and Spain was 12.77. Olpak and Arican suggest this is due to some of the 272 journal articles listed being removed. Another set of criticisms launched at the SSCI was authored by John B. Davis. He concluded that "one should only apply the impact-adjusted rankings using SSCI data with considerable caution when evaluating scholarly productivity of individuals and departments." He also noted research approaching

5110-444: Was based on only a quarter of its publications. Thus the actual number of citations for a single article in the journal is in most cases much lower than the mean number of citations across articles. Furthermore, the strength of the relationship between impact factors of journals and the citation rates of the papers therein has been steadily decreasing since articles began to be available digitally. The effect of outliers can be seen in

5183-580: Was conceptualized in 1961 when the founder of the Institute for Scientific Information , Eugene Garfield , received funding from the United States National Institutes of Health . He received this funding in order to produce a comprehensive index of Genetics literature, also known as Genetics Citation Index, although this later became known as the Science Citation Index. The SSCI was then established in 1972 by

5256-597: Was devised by Eugene Garfield , the founder of the Institute for Scientific Information (ISI) in Philadelphia. Impact factors began to be calculated yearly starting from 1975 for journals listed in the Journal Citation Reports (JCR). ISI was acquired by Thomson Scientific & Healthcare in 1992, and became known as Thomson ISI. In 2018, Thomson-Reuters spun off and sold ISI to Onex Corporation and Baring Private Equity Asia . They founded

5329-515: Was originally developed by the Institute for Scientific Information from the Science Citation Index . The Social Sciences Citation Index is a multidisciplinary index which indexes over 3,400 journals across 58 social science disciplines – 1985 to present, and it has 122 million cited references – 1900 to present. It also includes a range of 3,500 selected items from some of the world's finest scientific and technical journals. It has

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