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Two-year mean citedness, and how it relates to the impact factor

Two-year mean citedness is the average number of citations a venue's recent papers receive: citations in a year to the papers it published in the two years before, divided by the number of those papers. It is computed by OpenAlex from open data.

Compared with the impact factor

The Journal Impact Factor, published by Clarivate from Web of Science, is built the same way: citations in one year to the items of the two previous years, divided by the citable items of those years. The numbers differ because the two databases index different journals and count different document types, so don't mix them: compare a journal's citedness with other journals' citedness, not with their impact factors.

Limits

An average is pulled up by a few highly cited papers, review journals score high because reviews are cited a lot, and fields cite at very different rates. It is a measure of the venue's recent attention, not of any one paper.