This site, provided for the University of Michigan, is no longer maintained - last update was at the end of July 2020 - and should be considered archived. Statistics from Michigan are now available in a new COUNTER Release 5 IRUS service. Other US institutions are welcome to join this new IRUS service.

DOI Summary Statistics

This table shows, for each item type across all repositories where DOIs are available in the metadata that we harvest, the numbers of items of that type downloaded from repositories since joining IRUS-US and for each item type, the numbers and percentages that have DOIs available.

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Number of DOIs by item type

ItemType Items DOIs % with DOIs
Article 16,528 13,542 81.9
Audio 189 4 2.1
Book 190 12 6.3
Book Section 628 314 50.0
Conference Papers/Posters 376 9 2.4
Conference Proceedings 2 1 50.0
Dataset 153 2 1.3
Image 553 2 0.4
Moving Image 659 1 0.2
Music/Musical Composition 10 1 10.0
Other 1,436 55 3.8
Preprint 97 5 5.2
Report 2,819 83 2.9
Text 201 6 3.0
Thesis or Dissertation 3,210 1 0.0
Unknown 71,522 43,669 61.1
Working Paper 2,029 23 1.1
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