Due to a legal demand, impact factors have been removed from Lazy Scholar. For now, I have replaced them with Elsevier’s CiteScore metric, which is similar to how the impact factor is calculated, with an important difference in that it includes other types of publications such as editorials and letters to the editor, which may receive fewer citations as original research papers and result in a lower number in some instances compared to impact factor. For a comparison of the two, here’s a good article in Nature News, and more information about the metric can be found on the Scopus website.

If you have opinions whether another metric would be more appropriate, please let me know in the comments. Journal rankings can be a poor heuristic for the quality of individual papers, so I am also considering removing them completely in future updates.