Journal_Metrics

Impact Factor [1]: The average number of citations received in current year by the articles published in the journal over the previous two years.
$impact\_factor_y=\frac{citations_y}{publications_{y-1}+publications_{y-2}}$
CiteScore[2]: The average number of citations received in current year and previous 3 years by the articles published in the current and previous 3 years.
$CiteScore_y = \frac{citations_y+citations_{y-1}+citations_{y-2}+citations_{y-3}}{publications_y+publications_{y-1}+publications_{y-2}+publications_{y-3}}$

References