SCI journal IF is one of the factors to consider when many of us contribute, but the annual IF will be released around June, will be released in June 2017 IF 2016, which will contribute a lot of students have been affected .
For example, you are now ready to contribute in March next year, this time was in June 2017 announced IF. Wait till after your article was published, over six months, you vote for this journal IF has been re-updated, high IF the course happy, if the low IF may regret a lot of people voted this journal, and some even as this year's Plos One fell below three points have affected the graduation of some of Dr..
Let's look at IF SCI journals what changes this year.
Four variants of the three medical journals
Start with a large, previously has been circulating the four major medical journals argument, namely The New England Journal of Medicine (NEJM, IF = 72.406), The Lancet (IF = 47.831), JAMA (IF = 44.405) and BMJ ( Note, that is not Open, IF = 20.785).
We can see that this year NEJM skyrocketed, from 59 last year rose to 72.4 points directly, has been far the other three journals left behind. The Lancet and JAMA compared this year's gains, already lagging IF BMJ this year only rose 1 point, the gap farther and farther. And from a content point of view, BMJ nothing special high-quality articles, many of its sub-Journal Publishing Group, but did not make people appear bright spots.
God is only one of four published IF rise
Oncotarget, Medcine, Scientific Reports, Plos One. This four magazine dubbed China's four favorite biomedical researchers published God. Since the posting volume, high page charges (corresponding publication difficulty is low), the impact factor is also seen in the past (more than 3 points), loved by the majority of medical professionals. Press volume increased year by year, fishing gold fishing soft, but Fu Xi Misfortune, these journals in recent years, not only in terms of investment funds and other applications will be some discrimination, and their own impact factor also showed a downward trend.
This year in addition to Oncotarget (IF = 5.168) than last year (2015 IF = 5.008) increased slightly, the other three journals have a certain degree of diving. Medicine is to bottom, running all the way on the way water is published.
这些影响因子的变化牵动了无数科研人员的心，那能不能在投稿的时候就预估实时的影响因子呢？可以的，有个简单的办法可以自己计算当时的期刊影响因子。
WOS的妙用
我们知道IF是根据期刊文章引用量来的，最权威的数据就来自于WOS（Web of Science）。计算公式为：IF=C/(A+B)。
以最近的影响因子为例，其中，IF为该期刊2016年的影响因子，A为该期刊2015年发表的文章数量，B为该期刊2014年发表的文章数量，C为该期刊2014和2015年两年发表的文章在2016年被引用的总次数。对于此刻计算的IF，A和B已经确定，由于数据库检索滞后的原因C还未最终确定，所以此时计算的IF也就是实时IF。
根据上面的公式，进入WOS数据库里输入期刊名字。
图上红框是需要注意的地方，数据库一定要选择Web of Science核心，别把其他数据库也统计进去；检索项要选出版物名称；时间跨度要选前面两年。
检索后先把这个数字记下来，就是发表文章总数。
然后在文献类型里只选Article和Review，然后点击右上角的“创建引文报告”。
往下拉，找到引用频次那里，这个1201就是2017年的引用量。
所以Cell Research的实时IF就是1210/292=4.14，由于现在离2017年结束还有4个月，引用数还会上升，但文章总数不会变了，所以实际影响因子肯定比这要高。一般来说SCI期刊官方影响因子每年6月左右发布，那在当年的2、3月份用这个办法测出来的就会比较准。
WOS免费查的办法
我知道你们想说这个WOS数据库是要收费的，账号没有怎么办？简单！去中国科技网注册个中国科技云通行证（https://passport.escience.cn/regist.jsp），免费。
然后，在WOS下面的机构中选择“CSTCloud ID”那个就可以了。
