May 23, 2022

New Preprint: “The Open-Factor: Toward Impact-Aligned Measures of Open-Access Ebook Usage” (Preprint)

The following preprint was recently posted to Humanities Commons


The Open-Factor: Toward impact-Aligned Measures of Open-Access Ebook Usage


Eric Hellman
Free Ebook Foundation


via Humanities Commons


A statistical analysis of usage data for open-access ebooks from two different publishers and from a free ebook distribution platform indicates that open-access ebook usage is distributed following log-normal statistics. Using a quantity related to the logarithm of download counts, dubbed the “open-factor”, will measure impact in better alignment with the goals of open-access ebook publishing.

Direct to Bib Info and Link to Download Full Text

Update (April 3, 2019) Blog Post About Article by Eric Hellman (via Go To Hellman)

About Gary Price

Gary Price ( is a librarian, writer, consultant, and frequent conference speaker based in the Washington D.C. metro area. Before launching INFOdocket, Price and Shirl Kennedy were the founders and senior editors at ResourceShelf and DocuTicker for 10 years. From 2006-2009 he was Director of Online Information Services at, and is currently a contributing editor at Search Engine Land.