About Collection Statistics Data
The collection statistics presented here are based on circulation transactions for volumes held by the UW-Madison Libraries and full text downloads of book chapters for e-book subscriptions. The circulation statistics are based on the transactions originating within the Voyager Integrated Library System (ILS) and Alma Library Services Platform (LSP) during fiscal years 2006-2017 (July 1, 2005 - June 30, 2017). The UW-Madison Libraries migrated from Voyager to Alma in May 2015.
Circulation and item counts are limited to circulating collections. For example, most reference collections are not included in the volume counts presented here because their volumes cannot be checked out.
Revisions
August/October 2017
Incorporated data through fiscal year 2017 for the physcial materials loan data.
Data through FY17 will include loans for interlibrary loan (ILL) transactions in which UW-Madison items are loaned to other libraries throughout the country to fulfill requests for items they do not own. In July 2017, the UW-Madison Libaries implemented a change in how our circulation system manages these loans and they will no longer be counted in the data seen here.
The Veterninary Medicine Library data was removed. This library only had three volumes with six loans between 2006 and 2016.
Gale Book Report 2 COUNTER data added to the e-book visualization.
February 2017 #2:
Incorporated data through fiscal year 2016 for the phyiscal materials loan data and calendary year 2016 for e-book usage.
This revision represents a significant change for physical item usage because data was incorporated from a new source system. In addition to the Voyager ILS, which was used until May 2015, data is incorporated from the Alma Library Services Platform. Because each of these systems is distinct in terms of both their data model and our export capabilities, the data processing required a changes. The source data for these analyses and visualizations previously relied on internal item (e.g., volume) identifiers (item IDs). Because these systems do not share common item record IDs, the data processing switched to using a item barcodes as unique identifiers that are shared between both systems for the same items.
Note that the final month and a half of circulation statistics for FY2015 are also included by the addition of data from the Alma system that began generating circulation transactions on May 15, 2015. Between this revision and the last one, this results in a significant increase in the FY2015 loans for both faculty/staff and graduate students. This is due to the fact that these campus populations make heavy use of item renewal. At the end of the Spring 2015 semester many items checked out were renewed just prior to their May 31st loan return dates. These visualizations treat renewals as subsequent loans.
February 2017 #1:
Changed the calculations from counting loaned titles to counting loaned volumes. The effect of this change will be seen in the number of circulations associated with "boundwith" titles. Rather than counting each bound title loaned separately, this process will count the entire loaned volume once. See 201702.1.
February 2016:
Bug fix for double counting items that have circulated when calculating the size of a circulating collection. The effect that this had was to make each library's circulating collection look like it contained extra items. This therefore raised the percentage of volumes that never circulated. See 201602.
January 2016:
Initial version. See 201601.