The impact factor is an internationally accepted journal evaluation index, that is, the total number of citations of papers published in the first two years of a journal in a statistical year divided by the total number of papers published in the first two years of the journal. This index is a relative statistical value, which can overcome the deviation caused by different papers published in large and small journals. Generally speaking, the greater the influence factor, the greater its academic influence. Impact factor query: 1. To query the impact factors of foreign periodicals, we can use JCR(Journal of Reports) in the foreign language database Web of Science, in which JCR Science Edition is used to query natural science periodicals and JCR Social Science Edition is used to query humanities and social science periodicals. 2. To query the influencing factors of Chinese journals, you can use the Comprehensive Citation Report of China Academic Journals (edited by Wan Jinkan, Science Press) jointly published by China Academic Journals (CD-ROM Edition) and China Scientific Literature Metrology and Evaluation Center.
What if the impact factor is?
Difficulty coefficient of overcoming external force.
Difference between impact factors and sci impact factors
Impact factor (abbreviated as IF) refers to the frequency at which articles in a certain journal are cited in a specific year or period, and is an important indicator to measure the influence of academic journals. It was founded by eugene garfield, the founder of institute for scientific information (ISI) in the 1960s, and has brought a series of major innovations to the development of bibliometrics since then.
The calculation method is to divide the total number of citations of papers published in a journal in the first two years of the reporting year (JCR year) by the total number of papers published in this journal in these two years. This is an internationally accepted periodical evaluation index.
The American Science Citation Index (SCI) was founded by the institute for scientific information in Philadelphia in 1957, and it is a citation database created and published by institute for scientific information (ISI)1961+0.
So:
Impact factor is one of the indexes to evaluate journals. The influence factor of SCI is the IF of journals included in SCI.
What does the journal impact factor N/A mean?
The impact factor is calculated in years. Take the impact factor of a journal in 1992 as an example, if (1992) = A/B,
A = the number of times all articles in this journal were cited from 1990 to 199 1 in 1992;
B = the number of all articles in this journal from 1990 to 199 1.
affect
Many famous academic journals will indicate their influence factors on their websites to show their influence in the corresponding disciplines. For example, Journal of American Chemical Society, Oncogenes, etc. Major universities in Chinese mainland (such as Tsinghua, Harbin Institute of Technology and Zhejiang University) take the influence factors of academic journals as the main criteria for judging graduate students' graduation.
What are the influencing factors? How to obtain the influencing factors of academic journals
The impact factor was put forward by E 1 Garfield in 1972, and has become an internationally accepted index for periodical evaluation.
The impact factor of academic journals refers to the average citation rate of journals in the last two years, that is, the average citation times of papers published in the first two years of the evaluation year. Expressed as:
Impact factor = the number of times the papers published in the first two years of the journal were cited in the third year/the total number of papers published in the second year of the journal.
According to its definition, the three determinants of influencing factors are time (2 years), total number of papers (total number of papers published in periodicals for two consecutive years) and cited times (total number of papers cited in the third year).
The impact factor is a relatively quantitative index, which is generally considered to reflect the real and objective situation of the used journals and can fairly evaluate all kinds of academic journals. Usually, the greater the impact factor, the greater the academic influence and role of the journal!
What are the influencing factors in the paper?
Impact factor (IF) is a data in American ISI (institute for scientific information) JCR (Journal Citation Report). That is, the total number of citations of papers published by a journal in the first two years of a statistical year divided by the total number of papers published by the journal in the first two years. This is an internationally accepted periodical evaluation index.
What are the influencing factors of the expanded version?
The latest version of domestic impact factors-national science and technology support program, standardization, collation and processing of existing literature data, and construction of basic database for science and technology monitoring and evaluation (2006BAH03B0 1).
In order to establish a comprehensive evaluation index system of periodicals more scientifically and count the citation of periodicals more completely.
Measurement indicators, more efficient measurement and evaluation of periodical literature, so that the results of periodical statistical analysis are
Greater influence makes the selection of core journals more convincing and promotes the development of knowledge service system.
The Information Resource Center of China Institute of Science and Technology Information cooperates with Wan Fang Data Co., Ltd. to support the development of information technology in China.
With the support of supporting projects, combined with "standardization, collation, processing, scientific and technological monitoring and evaluation of existing documents"
Construction of price basic database (2006BAH03B0 1) ",and jointly compiled and published China Journal Citation.
Report (extended version).
China Journal Citation Report (Extended Edition) basically includes academic and technical scientific journals and theoretical research social science journals published in China, and it is an important check specially used for journal citation analysis and research.
Ask for evaluation tools. From this, we can clearly understand the citation and citation of periodicals, as well as the citation efficiency and citation.
Statistical analysis of network and periodical self-citation. At the same time, it is convenient to quantitatively evaluate the mutual influence of journals.
And correctly evaluate the role and position of a journal in the scientific exchange system, and determine highly cited works.
Group and so on.
The publication of China Journal Citation Report (Extended Edition) is an important event in China's periodical and intellectual circles.
It is an extension and supplement of Citation Report of China Sci-tech Journals (Core Edition). Citation of China periodicals
The newspaper (expanded edition) will provide comprehensive and complete evaluation data of Chinese periodicals, which is a national preferential support period.
Periodical evaluation provides scientific management basis for national periodical management departments and local provincial and municipal periodical management departments, including
It fills the gap of incomplete periodical evaluation data in China and is a very important scientific evaluation basis.
Basic engineering construction.
The 2009 edition of China Journal Citation Report (Extended Edition) needs to be continuously improved and enriched to make timely progress.
Supplement and revision of line indicators. I sincerely hope that China Journal Citation Report (Extended Edition) will be widely read.
Friendly assistant and effective tool for search and query, and eagerly look forward to "China Journal Citation Report (Extended Edition)".
It can be used as a reference for the development of social evaluation journals.
In the whole writing process, although we strive to be rigorous, standardized, meticulous and accurate, and strive for perfection, due to some
The actual situation, such as the renaming and merger of periodicals, the overlapping of university journals, and the nonstandard citation records of periodicals,
Different abbreviations or complex categories of periodicals have brought great difficulties to our editing work. all wet
Moreover, omissions are inevitable, and we sincerely hope that readers will give us comments, criticisms and corrections.
Does the impact factor refer to articles or periodicals? 15 point
This 0.4 impact factor refers to periodicals. You can see the influencing factors of different types of periodicals on HowNet.
What are the academic journals in SCI area?
According to the impact factor division of JCR journals published annually by American Institute of Information, SCI is included in the same theme.
Journals are sorted by influencing factors from high to low. The top 5% of academic impact factors are periodicals in An 1 region and academic impact factors.
The top 20% are An2 periodicals, and the top 50% are An3 periodicals. Post-theme influencing factors
50% are periodicals in An4 district; The source of the core periodicals included in EI is the periodicals in An5 district, among the corresponding periodicals in the above-mentioned districts.
The published papers are called An 1, An2, An3, An4 and An5 respectively.
What are the influencing factors of academic journals?
The impact factor was put forward by E 1 Garfield in 1972, and has become an internationally accepted index for periodical evaluation.
The impact factor of academic journals refers to the average citation rate of journals in the last two years, that is, the average citation times of papers published in the first two years of the evaluation year. Expressed as:
Impact factor = the number of times the papers published in the first two years of the journal were cited in the third year/the total number of papers published in the journal in two years.
According to its definition, the three determinants of influencing factors are time (2 years), total number of papers (total number of papers published in periodicals for two consecutive years) and cited times (total number of papers cited in the third year).
The impact factor is a relatively quantitative index, which is generally considered to reflect the real and objective situation of the used journals and can fairly evaluate all kinds of academic journals. Usually, the greater the impact factor, the greater the academic influence and role of the journal!
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