van Nierop E. The introduction of the 5-year impact factor: does it benefit statistics journals? Statistica Neerlandica 2010;64(1):71-6
Impact factors for statistics journals are low compared with those in other disciplines. In 2008, the Thomson Institute for Scientific Information introduced the 5-year impact factor (IF5), that uses the 5-year window instead of the traditional 2-year window (IF2). After having investigated the differences in both impact factors calculations between statistics journals and journals in other disciplines, the results show that statistics journals are among the categories that show a substantial increase in impact factor when moving from IF2 to IF5. This increase is observed in most disciplines but it is quite strong for the statistics discipline. When comparing Science and Social Science, the new impact factor calculation appears to benefit Social Sciences most.