Assessing the coverage by LOCKSS of Free Electronic Journals

LOCKSS, as a electronic journal digital preservation system, covers subscribed and freely available journals. I have been looking at the balance of activated titles at De Montfort University and found about 43% to be subscribed titles and 27% to be journals listed in the Directory of Open Access Journals.
A further category of journals would be those available without charge, but not included in the DOAJ. These would be included in the SFX Free ejournals target. However there might be an overlap between this target and the DOAJ.

Num. of Titles Unique Title Overlap % Unique Titles % Title Overlap
Set 1 676 557 119 82.4 17.6
LOCKSS 676 557 119 82.4 17.6
Set 2 20479 20360 119 99.4 0.6
Free E- Journals 20479 20360 119 99.4 0.6

The overlap between LOCKSS and DOAJ/Free Ejournals combined in 276 titles or 40.8%.

About Philip Adams

Senior Assistant Librarian at De Montfort University. I have recently introduced a Single Sign On service for the library's databases and electronic journals. I am interested in digital preservation and the use of data to measure a library's impact. All comments own.
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