1. Scatter and Decay: E- Journal Usage Patterns Carol Tenopir, UT SIS Gayle Baker, UT Libraries David Nicholas,University College London

2. Maximizing Library Investments Through Better Data Gathering and Analysis: Maxdata

3. MaxData Objectives To compare different methods of data collection To develop a model that compares costs and benefits to the library of collecting and analyzing data from various methods To help libraries make the best use of data

4. TeamsUsage DataUniversitiesPopulationFormat Deep Log (Ciber) All OhioLink, 4 Ohio Faculty & Students, combined Electronic Library only SurveysUTK, 4 Ohio, 2 Australian Faculty & Students, separate Electronic and Print, Library and Non-Library Vendor Reports UTKFaculty & Students, combined Electronic Library only Survey Methods and Populations

5. 2 Findings for Today 1. Scatter 2. Decay

6. Scatter To go in many directions The relative dispersion of points on a graph, especially with respect to a mean value, or any curve used to represent the points. Reading varies by subject discipline

7. Average Number of Articles Read per year by US University Faculty and Students by subject disciplines (surveys/all readings)

8. Downloads by Subject (Sept – Nov 2005) - 4 Ohio universities

10. Number of downloads by subject (staff v student) - Sept to Nov 2005, 4 Ohio universities

11. Ave Minutes/reading/University Faculty Member (surveys)

12. Average number of seconds per view by subject Sept – Nov 2005 - 4 Ohio universities

13. UTenn COUNTER JR1 Usage Data, Sep.-Nov. 2005

14. Full text downloads cumulated per title, Sept – Nov, 2005 UTenn

15. Full text downloads cumulated per title, Sept – Nov, 2005 - 4 Ohio Universities

16. Decay the process of gradually becoming inferior a gradual decrease Reading falls by age of articles

17. Decay of Article Readings by U.S. University Faculty

18. Decay in article downloads (by year) – Sept to Nov 2005 4 Ohio universities

19. Nicholas, Huntington, Jamali and Tenopir. Article Decay in the Digital Environment: An Analysis of Usage of OhioLINK by Date of Publication, Employing Deep Log Methods, JOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE AND TECHNOLOGY, 57(13):1840–1851, 2006.

20. Decay of Article Readings by Subject Discipline: U.S. Faculty

21. Decay in article downloads (by year) - Sept to Nov 4 Ohio universities – by subject

22. Next Steps Continue to analyze, compare, and contrast various methods Examine more possibilities of log collection in libraries Calculate time/cost of all methods Compare benefits of all methods with costs