随着Early Access(有的出版社用Online First或其他类似表达)的进展，影响因子的计算也相应地会在明年微调，相关政策已经发布，Clarivate官网链接：

https://clarivate.com/webofsciencegroup/article/whats-next-for-jcr-defining-early-access/

What’s next for JCR: defining ‘Early Access'

• This means that the 2020 JIF numerator will include citations from:
  

• Early Access items with an early access year of 2020

• Early Access items with a final publication year of 2020 and an Early Access year of 2019 or earlier*

• Non-Early Access items with a final publication year of 2020

* This is a transitional step for the 2021 JCR release (2020 data) only.

2020 JIF denominator

There will be no Early Access contribution to the 2020 JIF denominator; the denominator will only include citable items with a final publication date of 2018 and 2019.