This chart shows the 2-year article impact factor of British Journal of Politics and International Relations over time and its percentile among journals. Only research articles are counted in both the numerator (citations) and denominator (citable items).
The 2-year article impact for year X equals the citations received in year X to research articles published in years X-1 and X-2, divided by the number of research articles published in those two years. Unlike the standard 2-year impact, only items classified as research articles are counted in both the numerator and denominator.
