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Nowadays, impact factors play an important role in evaluating the quality of academic journals. Many academic journals at home and abroad attach great importance to the impact factors of publications, and regard the ranking of impact factors as an important evaluation criterion for journal quality. Some of the journals also link the impact factor with the editor's performance appraisal and professional title evaluation. A high impact factor indicates outstanding work performance and will be given priority when promoting professional titles. Academic journal authorities and journal associations also regard the size of the impact factor as an important indicator for evaluating journal grades. Generally speaking, journals with high impact factors and high citation frequencies will basically be rated as excellent journals.
The impact factor was proposed by Garfield in 2001 and has now become an internationally accepted journal evaluation index. The academic journal impact factor (refers to the average citation rate of a journal in the past two years, that is, the journal’s publications in the first two years The average number of citations of papers in the year of evaluation.
Expressed by the formula: impact factor The number of times papers published by the journal in the year before were cited in year The total number of papers published by the journal in the year before. It can be seen from its definition , the determinants of the impact factor are the time (year), the total number of papers (the total number of papers published by the journal in consecutive years), and the number of citations (the total number of citations of the above-mentioned papers in the year). The impact factor is a relative quantity indicator, It is generally believed that it can better reflect the real and objective situation of journal use, and can fairly evaluate various academic journals. Generally, the greater the impact factor, the greater the academic influence and role of the journal.
Determine the size of the impact factor The factors generally include the following four aspects: first, the paper factor, the publication time lag of the paper, the length, type of the paper, the number of collaborators, etc. will all affect the level of the impact factor; the second is the journal factor, the issue and type of the journal, The page number, number of papers published in an issue, etc. will all affect the size of the impact factor. In the calculation of the impact factor, the number of published papers only includes papers, briefs, and reviews, while comments, letters, etc. are not counted. Therefore, if the space used for such text If there are more, it will affect the impact factor. The third is subject factors. The number of journals in different disciplines, the average number of references, the citation half-life, etc. will all affect the level of the impact factor. The fourth is the retrieval system. Now, there are many domestic and foreign academic journals retrieval System, the main foreign retrieval systems include: the American "Science Citation Index" (), the British "Scientific Literature" (), the German "Mathematical Abstracts" (b), the Russian "Abstract Magazine" (), and the Japanese "Scientific and Technical Literature Express" "(B) and other important domestic retrieval systems mainly include: "National Newspaper and Periodical Index", "China Mathematics Abstracts", "China Inorganic Analytical Chemistry Abstracts", "China Academic Journals (CD Version)", Wanfang Data Digital Journal Group, etc. Due to the large differences in the composition of the journal groups included in the retrieval system, the calculated impact factor values are greatly different. Therefore, the same publication has significantly different impact factors in different retrieval systems.
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