RePEc has been publishing rankings of various sorts for over a decade. While many of them can still be considered experimental due to limitations in the data, they have had an impact on the evaluations of institutions, economists and journals in quite a few instances. Gradually, these rankings have been expanded to cover more and more aspects of academic life, as well as slicing them by fields, geography, gender and age. These rankings have typically considered all publications listed in RePEc. This can be a disadvantage for younger economists and publication series (although there are criteria that discount citations by age, for example).
We are now introducing a new set of rankings that limit themselves to publications in the last 10 years. For example, to compute an impact factor for a journal, only articles published in the last 10 years are considered. For an economist, anything published over 10 years ago is dismissed (unless the article version falls within 10 years). The ranking page has links to all those new 10-year rankings.
A few caveats: As samples are smaller than for the general rankings, the 10-year rankings will be more volatile, and any measurement error will be larger. For this reason, the 10-year rankings are not computed for fields and geographies. Also, any criterion that is based on recursive factors will still need some time to stabilize as they have to go through several iterations for them to converge, and they will never fully converge, as new data keeps coming in and data will have to be dropped every year. Finally, we cannot count research from publishers who do not supply publication years.
Posted by Christian Zimmermann 
The RePEc Blog 