Scholarly Communication Analytics: Open Access Evidence in Unpaywall
peter.suber's bookmarks 2019-06-06
Summary:
"We investigated more than 31 million scholarly journal articles published between 2008 and 2018 that are indexed in Unpaywall, a widely used open access discovery tool. Using Google BigQuery and R, we determined over 11.6 million journal articles with open access full-text links in Unpaywall, corresponding to an open access share of 37 %. Our data analysis revealed various open access location and evidence types, as well as large overlaps between them, raising important questions about how to responsibly re-use Unpaywall data in bibliometric research and open access monitoring...."