Jisc and the JUSP team recently coordinated a representative group of publishers and librarians to discuss the perils of ebook usage statistics during a meeting in London on 7th July 2016. A report describing the meeting and outlining next steps is available via the JUSP website: http://jusp.mimas.ac.uk/news/JUSP-ebook-discussion-forum-report-20160714.pdf.
The following poster http://hdl.handle.net/2142/31329 outlines the systematic study of an academic library ebook collection. It gives attention to the difficulties encountered in gathering and analyzing ebook usage data.
The following article that explores the correlation between journal use and research output of academic institutions in South Korea is freely available at http://link.springer.com/article/10.1007%2Fs11192-015-1563-0#. Jung Y. et al (2015) Statistical relationships between journal use and research output at academic institutions in South Korea, Scientometrics June 2015, Volume 103, Issue 3, pp 751-777. DOI: 10.1007/s11192-015-1563-0