How topical and important are articles published in journal? Which journals should a researcher skim through if he wants to keep up with new and exciting research? One measure that attempts to quantify this is immediacy index of journals.
Immediacy Index: How it is Calculated
Immediacy index and journal impact factor (IF) are both calculated by the Institute for Scientific Information and in much the same way: for a certain publication time range, the total citations of a journal’s papers during one year is divided by the number of papers. This gives an average number of citations per paper for the year in question.