On June 30th, 20021,20021(2020) journal impact factor was released! Since 1975, Clarivate has been published in periodical citation report (JCR) regularly every year. The report contains more than 20,000 periodicals from five continents 1 13 countries, covering 254 disciplines such as science, social science, art and humanities.

In terms of journal impact factors, the impact factors of CA-A cancer journals on clinicians are as high as 508.7, and the top three CNS journals, Cell, are 4 1.582, Nature, 49.962 and Science, 47.728.

This year, the calculation method of "journal citation report" has changed, and the content published online in 2020 (early access articles) will also be introduced into the JCR calculation of 202 1.

According to Clarivate's official statement, the denominator of JCR in 2020 will not be affected, but the numerator of JCR in 2020 will include three parts:

1, the official publication date is 2020.

2. Published papers as early as 2020.

3. Early acquisition of papers with the publication date of 20 19 or earlier will lead to a significant increase in the impact factors in 2020, and the overall situation is on the rise.