The graph shows the changes in the g-index of BMJ Open and its the corresponding percentile for the sake of comparison with the entire literature. G-index is a scientometric index similar to h-index but put a more weight on the sum of citations. G-index of a journal is g if the journal has published at least g papers with total citations of g2.
How are inpact factors calculated?
The impact factor (IF) is calculated by counting citations from peer-reviewed journals only.
extended IF also counts citations from books and conference papers. However, no patent, abstract, working papers, online documents, etc., are covered.
