Claremont Colleges Scholarship @ Claremont Library Staff Publications and Research Library Publications 11-6-2015 Interpret the numbers: Putting e-book usage statistics in context Maria Savova Claremont University Consortium Madelynn Dickerson Claremont University Consortium Recommended Citation Savova, Maria and Dickerson, Madelynn, "Interpret the numbers: Putting e-book usage statistics in context" (2015). 35th Annual Charleston Conference: Issues in Book and Serial Acquisition. Charleston, SC. Library Staff Publications and Research. Paper 35. http://scholarship.claremont.edu/library_staff/35 This Presentation is brought to you for free and open access by the Library Publications at Scholarship @ Claremont. It has been accepted for inclusion in Library Staff Publications and Research by an authorized administrator of Scholarship @ Claremont. For more information, please contact scholarship@cuc.claremont.edu.
Interpret the numbers: Putting e-book usage statistics in context Maria Savova Director of Information Resources and Systems Madelynn Dickerson Information Resources Coordinator
Goal of the study To understand our e-book usage data by providing meaningful context to the statistics we collect
Our data viewed through the prism of: Access type owned vs. subscribed vs. DDA Simultaneous user access Rights restrictions - DRM or not Publication year Subject/discipline: o Breadth vs. intensity o In comparison with print o In correlation with user discipline distribution
Data scope: E-books www.fernandobiz.com E-book holdings as of Jan 2015 (363,691 titles) E-book usage data for Jan-Dec 2014
Data scope: Print Print holdings as of Jan 2015 (793,556 titles) Print circulation statistics Jan Dec 2014 Resource sharing statistics for print books borrowed by CCL patrons Jan Dec 2014
Excluded from the study o All print and e-books with unknown classification/publication year (~18,000 print books and ~130,000 e-books) o Any e-book collection without available title-bytitle usage (~66,000 titles) o All theses/dissertations in both formats o All government documents (~98,000 e-titles and ~114,000 print titles)
Our data E-books: o Detailed holdings and usage data kindly provided by our vendors o Title lists from WMS knowledge base, as well as aggregators and publisher websites o COUNTER BR2: Section requests (in the vast majority of cases) o COUNTER BR1: Title requests (when section request data were not available) www.highradius.com Print books: o OCLC Analytics holdings data o Local circulation statistics checkouts + renewals o Titles borrowed via Resource Sharing aggregated Link+ and ILL data
500000 450000 400000 350000 E-book holdings vs. e-book usage per access type 14% 1% 24% 300000 250000 14% Owned titles turnover 2.3 200000 150000 72% Subscription titles turnover 1.3 75% 100000 50000 0 Total holdings All usage Subscription Owned DDA
180000 160000 E-book holdings vs. e-book usage per access type by discipline 0.6% 9% 140000 2% 10% 0.7% 120000 100000 4% 22% 3% 6% 16% 55% 80000 29% 91% 60000 88% 40000 20000 0 93% AH holdings 72% SS holdings 55% STEM holdings MD holdings 11% 53% 36% 44% 0.4% 77% 23% AH usage SS usage STEM usage MD usage Subscription Owned DDA
400000 350000 Proportion of used e-book titles by access type 7% 300000 250000 6% 200000 150000 100000 50000 6% 15% 0 DDA owned subscription Overall Titles without usage Titles with usage
25.0 Average number of uses per used title by access type 22 20.0 18 15.0 15 10.0 5.0 1.4 0.0 DDA owned subscription Overall
E-book holdings by simultaneous access model Limited (1-3 users) 1.3% Unlimited 98.7%
Proportion of unlimited access holdings vs. unlimited access used titles 98.80% 98.70% 98.65% 98.68% 98.60% 98.50% 98.40% 98.30% 98.24% 98.20% 98.10% 98.00% Total holdings Used titles Not used titles
Average number of uses per used title 19.5 19.2 19.0 18.5 18.0 17.5 17.5 17.0 16.5 Limited simultaneous access Unlimited simultaneous access
E-book holdings by access rights non-drm 15% DRM 85%
Proportion of DRM vs. non-drm e-books holdings per subject 50000 45000 11% 40000 35000 30000 25000 20000 15000 10000 5000 0 0.2% 4% 1.4% 9% 45% 60% 0.1% 22% 16% 13% 0.9% 0.1% 54% 44% 20% 3% 5% 0.1% 13% 0.4% 42% 5% DRM Non-DRM
120% Proportion of used DRM vs. non- DRM e-book titles 100% 80% 15% 28% 60% 40% 85% 72% 20% 0% Total holdings Used DRM Non-DRM
4000 3500 Proportion of used DRM vs. non-drm e-book titles per subject 6% 3000 2500 15% 90% 11% 2% 9% 2000 1500 1000 500 0 5% 6% 2% 42% 76% 0.1% 68% 35% 1% 74% 71% 41% 5% 26% 1% 46% DRM used Non-DRM used
What does this result mean? http://office.microsoft.com/en-ca/images Non-DRM e-books represent bigger proportion of used titles that than they do of all titles, except in history (non-drm history e-books are 13% of all holdings, and only 11% of all used titles) Non-DRM books are more desirable? Non-DRM books are easier to access? Non-DRM books are more easily discoverable?
E-book holdings by publication year 180000 160000 100 years 10 years 158,123 1 year 140000 120000 100000 80000 60000 40000 20000 0 38 1,171 274 365 322 338 329 669 1,286 1,997 7,492 40,528 21,850 34,853 28,869 28,556 23,992 E-books
E-book holdings by publication year in context 180000 160000 100 years 10 years 158,123 1 year 140000 137,199 129,046 120000 100000 97,038 108,212 80000 75,124 60000 40000 20000 0 189 823 4,524 6,795 38 43,031 33,257 26,426 30,761 29,923 14,029 16,165 1,171 274 365 322 338 329 669 1,286 1,997 7,492 40,528 21,850 34,853 28,869 28,556 23,992 8,232 8,296 9,193 9,825 5,468 E-books Print books
250000 2014 e-book usage stats by publication year 211,264 200000 150000 100000 50000 30,172 41,348 51,109 55,080 37,875 18,205 0 77 21 37 20 44 43 224 1,073 1,247 5,574 0 Total usage
250000 2014 e-book usage stats by publication year in context 211,264 200000 150000 100000 50000 30,172 41,348 51,109 55,080 37,875 18,205 0 77 21 37 20 44 43 224 1,073 1,247 5,574 0 Total usage Total holdings
2.50 Average number of uses per available title 2.00 1.77 1.93 1.50 1.34 1.30 1.09 1.00 0.83 0.62 0.74 0.74 0.76 0.50 0.33 0.00 0.00 0.07 0.08 0.10 0.06 0.13 0.13
180000 160000 Percentage of available titles with usage in 2014 7% 140000 120000 100000 80000 60000 40000 20000 0 3% 5% 5% 3% 5% 6% 6% 6% 6% 5% 6% 7% 9% 10% 9% 6% Titles not used Titles used
25.00 Average number of uses per used title 20.00 20.07 20.48 20.24 17.34 15.00 14.12 13.56 13.43 12.69 12.38 11.13 10.00 5.60 5.00 2.57 1.50 2.06 1.82 2.59 2.05 0.00
Takeaways from publication year analysis It is essential to correlate titles lists to usage reports to highlight the titles with zero usage E-book holdings are quite low through the end of 20 th century publication year E-book publishing picks up in the 1990s and as of the early 2000s it surpasses print holdings The highest usage per title is observed in e-books published within the last 5-10 years E-books published between the 1960s and the 1990s however show significant usage as well
E-book holdings by subject 50000 47,206 45000 40000 34,691 37,337 35000 30000 28,255 26,106 25,742 27,888 25000 19,534 20000 15000 10000 5000 3,004 2,530 4,941 9,501 5,159 14,211 5,694 8,462 8,012 10,298 8,063 1,373 10,064 14,295 11,326 0 E-books
200000 180000 160000 140000 120000 100000 80000 60000 40000 20000 0 E-book holdings by subject in context 5,159 19,534 28,255 26,106 11,326 E-books Print books
70000 60000 Total e-book uses per subject 59,262 50000 40000 38,504 37,650 32,077 45,308 39,275 44,700 30000 22,080 19,199 19,082 20000 10000 3,117 4,960 6,612 5,334 1,172 12,091 6,415 10,710 16,356 14,182 2,095 4,806 10,752 0 Uses
Total e-book uses per subject 70000 60000 59,262 50000 40000 38,504 37,650 32,077 45,308 39,275 44,700 30000 20000 10000 3,117 4,960 6,612 5,334 1,172 12,091 6,415 10,710 16,356 14,182 22,080 19,199 2,095 4,806 19,082 10,752 0 Uses
70000 Total e-book uses per subject in context 60000 50000 40000 30000 20000 10000 0 Total holdings Uses
3.00 Average number of uses per available e-title per subject 2.50 2.38 2.00 1.50 1.00 1.04 1.96 1.34 0.82 1.93 0.85 1.14 1.13 1.71 1.21 1.27 2.04 1.38 0.85 1.53 1.53 1.33 0.95 1.60 0.50 0.56 0.23 0.48 0.00
Percentage of available e-book titles with usage in 2014 50000 45000 5% 40000 35000 30000 25000 20000 15000 10000 5000 0 4% 8% 8% 5% 4% 13% 5% 6% 5% 2% 6% 4% 8% 10% 5% 9% 13% 9% 3% 8% 9% 8% Titles not used Titles used
Broad usage vs. intensity The overall turnover of e-book titles is 1.25 i.e. per average every available title has been used 1.25 times during 2014 All of e-book usage in 2014 comes from only 7% of all available titles per subject that number varies between 4% (agriculture, chemistry, and law) and 13% (philosophy & religion)
35.00 Average number of uses per used e-book title per subject 31.69 30.00 28.60 25.00 20.00 15.00 10.00 24.82 17.56 16.41 11.28 24.94 21.75 19.84 19.55 16.37 15.05 24.88 25.30 17.31 18.12 18.77 17.24 17.57 15.50 13.82 11.71 10.32 5.00 5.30 0.00
Most and least used titles Reference (dictionary) - 9,428 uses Language, linguistics, & literature book 3,899 uses Education book 2,652 uses Sociology title 2,506 uses History title 2,359 uses Geography & earth sciences 632 uses Physical sciences 466 uses Physical education & recreation 377 uses Mathematics & statistics 308 uses Chemistry - 57 uses
200000 180000 160000 140000 120000 100000 80000 60000 40000 20000 0 E-book vs. print books holdings by subject 5,159 19,534 28,255 26,106 11,326 E-books Print books
25000 Print books circulation during 2014, including borrowed via resource sharing 20000 15000 10000 5000 0 Local checkouts Resource sharing requests
E-book usage compared to print usage 70000 60000 50000 40000 30000 20000 10000 0 Agriculture print books Agriculture e-books Anthropology print books Anthropology e-books Art & architecture print books Art & architecture e-books Biological Sciences print books Biological sciences e-books Business & economics print books Business & economics e-books Chemistry print books Chemistry e-books Computer science print books Computer science e-books Education print books Education e-books Engineering & technology print books Engineering & technology e-books Geography & earth sciences print books Geography & earth sciences e-books History print books History e-books Language, linguistics & literature print books Language, linguistics & literature e-books Law print books Law e-books Library science, generalities & reference print books Library science, generalities & reference e-books Mathematics & statistics print books Mathematics & statistics e-books Medicine & health print books Medicine & health e-books Music & performing arts print books Music & performing arts e-books Philosophy & religion print books Philosophy & religion e-books Physical education & recreation print books Physical education & recreation e-books Physical sciences print books Physical sciences e-books Political science print books Political science e-books Psychology print books Psychology e-books Sociology print books Sociology e-books Section requests Local checkouts Resource sharing requests
300.0 Average number of uses per 100 available titles 250.0 238 200.0 150.0 100.0 104 196 134 82 193 85 114 113 171 121 127 204 138 85 153 153 133 95 160 50.0 0.0 4 16 13 3 56 23 8 5 4 9 6 4 10 11 22 2 9 10 17 15 31 48 8 12 22 19 Turnover rate of print books Turnover rate of e-books
Book holdings and usage statistics vs. user distribution per discipline 100% 2% 4% 2% 3% 90% 80% 37% 29% 32% 28% 31% 17% 11% 70% 24% 28% 60% 50% 35% 35% 31% 31% 40% 41% 30% 56% 61% 20% 10% 21% 35% 30% 37% 36% 0% Students Faculty E-book holdings E-book usage E-book used titles Print book holdings Print book checkouts AH SS STEM MD
THANK YOU! QUESTIONS? maria_savova@cuc.claremont.edu madelynn_dickerson@cuc.claremont.edu