interpret the numbers: putting e-book usage …savova, maria and dickerson, madelynn,...
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Claremont CollegesScholarship @ Claremont
Library Staff Publications and Research Library Publications
11-6-2015
Interpret the numbers: Putting e-book usagestatistics in contextMaria SavovaClaremont University Consortium
Madelynn DickersonClaremont University Consortium
This Presentation is brought to you for free and open access by the Library Publications at Scholarship @ Claremont. It has been accepted for inclusionin Library Staff Publications and Research by an authorized administrator of Scholarship @ Claremont. For more information, please [email protected].
Recommended CitationSavova, Maria and Dickerson, Madelynn, "Interpret the numbers: Putting e-book usage statistics in context" (2015). 35th AnnualCharleston Conference: Issues in Book and Serial Acquisition. Charleston, SC. Library Staff Publications and Research. Paper 35.http://scholarship.claremont.edu/library_staff/35
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 • E-book holdings as of Jan 2015 (363,691 titles) • E-book usage data for Jan-Dec 2014
www.fernandobiz.com
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-by-title 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)
• Print books: o OCLC Analytics holdings data o Local circulation statistics – checkouts + renewals o Titles borrowed via Resource Sharing – aggregated
Link+ and ILL data
www.highradius.com
72%
75%
14%
24%
14%
1%
0
50000
100000
150000
200000
250000
300000
350000
400000
450000
500000
Total holdings All usage
E-book holdings vs. e-book usage per access type
Subscription Owned DDA
Owned titles turnover – 2.3 Subscription titles turnover – 1.3
93% 72%
55%
36%
91%
88%
44%
23%
3% 6%
29%
53%
9%
10%
55%
77%
4% 22% 16%
11%
0.6%
2%
0.7%
0.4%
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
AHholdings
SS holdings STEMholdings
MDholdings
AH usage SS usage STEM usage MD usage
E-book holdings vs. e-book usage per access type by discipline
Subscription Owned DDA
6% 15%
6%
7%
0
50000
100000
150000
200000
250000
300000
350000
400000
DDA owned subscription Overall
Proportion of used e-book titles by access type
Titles without usage Titles with usage
1.4
15
22
18
0.0
5.0
10.0
15.0
20.0
25.0
DDA owned subscription Overall
Average number of uses per used title by access type
Limited (1-3 users) 1.3%
Unlimited 98.7%
E-book holdings by simultaneous access model
98.65%
98.24%
98.68%
98.00%
98.10%
98.20%
98.30%
98.40%
98.50%
98.60%
98.70%
98.80%
Total holdings Used titles Not used titles
Proportion of unlimited access holdings vs. unlimited access used
titles
19.2
17.5
16.5
17.0
17.5
18.0
18.5
19.0
19.5
Limited simultaneous access Unlimited simultaneous access
Average number of uses per used title
non-DRM 15%
DRM 85%
E-book holdings by access rights
0.2% 4% 1.4%
9%
11%
45%
60%
0.1%
22%
16%
13% 0.9%
0.1% 54% 44%
20%
3%
5%
0.1%
13%
0.4% 42%
5%
05000
100001500020000250003000035000400004500050000
Proportion of DRM vs. non-DRM e-books holdings per subject
DRM Non-DRM
85% 72%
15% 28%
0%
20%
40%
60%
80%
100%
120%
Total holdings Used
Proportion of used DRM vs. non-DRM e-book titles
DRM Non-DRM
5% 6% 2% 42%
15%
76%
90%
0.1%
68%
35%
11% 2%
1% 74%
71%
41%
5%
6%
26%
1% 46%
9%
0
500
1000
1500
2000
2500
3000
3500
4000
Proportion of used DRM vs. non-DRM e-book titles per subject
DRM used Non-DRM used
What does this result mean? • 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?
http://office.microsoft.com/en-ca/images|
38 1,171 274 365 322 338 329 669 1,286 1,997
7,492
40,528
158,123
21,850 28,869 28,556
34,853
23,992
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
E-book holdings by publication year
E-books
100 years 10 years 1 year
38 1,171 274 365 322 338 329 669 1,286
1,997 7,492
40,528
158,123
21,850 28,869 28,556
34,853
23,992
189 823 4,524
6,795
33,257
14,029 16,165
26,426 30,761 29,923
43,031
75,124
97,038
108,212
137,199 129,046
8,232 8,296 9,193 9,825 5,468
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
E-book holdings by publication year in context
E-books Print books
100 years 10 years 1 year
0 77 21 37 20 44 43 224 1,073 1,247 5,574
30,172
211,264
41,348 51,109 55,080
37,875
18,205
0
50000
100000
150000
200000
250000
2014 e-book usage stats by publication year
Total usage
0 77 21 37 20 44 43 224 1,073 1,247 5,574
30,172
211,264
41,348 51,109 55,080
37,875
18,205
0
50000
100000
150000
200000
250000
2014 e-book usage stats by publication year in context
Total usage Total holdings
0.00 0.07 0.08 0.10 0.06
0.13 0.13
0.33
0.83
0.62 0.74 0.74
1.34 1.30
1.77
1.93
1.09
0.76
0.00
0.50
1.00
1.50
2.00
2.50
Average number of uses per available title
3% 5% 5% 3% 5% 6% 6% 6% 6% 5%
6%
7%
7% 9% 10% 9%
6%
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
Percentage of available titles with usage in 2014
Titles not used Titles used
2.57 1.50
2.06 1.82 2.59
2.05
5.60
14.12
11.13
13.56 13.43
20.07
17.34
20.48 20.24
12.69 12.38
0.00
5.00
10.00
15.00
20.00
25.00
Average number of uses per used title
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 20th 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
3,004 2,530 4,941
9,501
47,206
5,159
19,534
14,211
28,255
5,694
34,691 37,337
8,462 8,012 10,298
26,106
8,063
25,742
1,373
10,064
14,295 11,326
27,888
05000
100001500020000250003000035000400004500050000
E-book holdings by subject
E-books
5,159
19,534 28,255 26,106
11,326
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
200000
E-book holdings by subject in context
E-books Print books
3,117 4,960 6,612 5,334
38,504
1,172
37,650
12,091
32,077
6,415
59,262
45,308
10,710
16,356 14,182
22,080 19,199
39,275
2,095 4,806
19,082
10,752
44,700
0
10000
20000
30000
40000
50000
60000
70000
Total e-book uses per subject
Uses
3,117 4,960 6,612 5,334
38,504
1,172
37,650
12,091
32,077
6,415
59,262
45,308
10,710
16,356 14,182
22,080 19,199
39,275
2,095 4,806
19,082
10,752
44,700
0
10000
20000
30000
40000
50000
60000
70000
Total e-book uses per subject
Uses
0
10000
20000
30000
40000
50000
60000
70000
Total e-book uses per subject in context
Total holdings Uses
1.04
1.96
1.34
0.56
0.82
0.23
1.93
0.85
1.14 1.13
1.71
1.21 1.27
2.04
1.38
0.85
2.38
1.53 1.53
0.48
1.33
0.95
1.60
0.00
0.50
1.00
1.50
2.00
2.50
3.00
Average number of uses per available e-title per subject
4% 8% 8%
5%
5%
4%
13% 5%
6%
5%
2% 6%
4% 8% 10%
5%
9%
13%
9%
3% 8%
9%
8%
05000
100001500020000250003000035000400004500050000
Percentage of available e-book titles with usage in 2014
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)
28.60
24.82
16.41
11.28
17.56
5.30
15.05 16.37
19.84 21.75
24.94
19.55
31.69
24.88
13.82 15.50
25.30
11.71
17.31 18.12 17.24
10.32
18.77 17.57
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
Average number of uses per used e-book title per subject
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
5,159
19,534 28,255 26,106
11,326
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
200000
E-book vs. print books holdings by subject
E-books Print books
0
5000
10000
15000
20000
25000
Print books circulation during 2014, including borrowed via resource
sharing
Local checkouts Resource sharing requests
0
10000
20000
30000
40000
50000
60000
70000
Agr
icul
ture
pri
nt b
ooks
Agr
icul
ture
e-b
ooks
Ant
hrop
olog
y pr
int b
ooks
Ant
hrop
olog
y e-
book
s
Art
& a
rchi
tect
ure
prin
t boo
ksA
rt &
arc
hite
ctur
e e-
book
s
Biol
ogic
al S
cien
ces p
rint
boo
ksBi
olog
ical
scie
nces
e-b
ooks
Busi
ness
& e
cono
mic
s pri
nt b
ooks
Busi
ness
& e
cono
mic
s e-b
ooks
Che
mis
try
prin
t boo
ksC
hem
istr
y e-
book
s
Com
pute
r sci
ence
pri
nt b
ooks
Com
pute
r sci
ence
e-b
ooks
Educ
atio
n pr
int b
ooks
Educ
atio
n e-
book
s
Engi
neer
ing
& te
chno
logy
pri
nt b
ooks
Engi
neer
ing
& te
chno
logy
e-b
ooks
Geo
grap
hy &
ear
th s
cien
ces p
rint
boo
ksG
eogr
aphy
& e
arth
sci
ence
s e-b
ooks
His
tory
pri
nt b
ooks
His
tory
e-b
ooks
Lang
uage
, lin
guis
tics
& li
tera
ture
pri
nt b
ooks
Lang
uage
, lin
guis
tics
& li
tera
ture
e-b
ooks
Law
pri
nt b
ooks
Law
e-b
ooks
Libr
ary
scie
nce,
gen
eral
ities
& re
fere
nce
prin
t boo
ksLi
brar
y sc
ienc
e, g
ener
aliti
es &
refe
renc
e e-
book
s
Mat
hem
atic
s & st
atis
tics p
rint
boo
ksM
athe
mat
ics &
stat
istic
s e-b
ooks
Med
icin
e &
hea
lth p
rint
boo
ksM
edic
ine
& h
ealth
e-b
ooks
Mus
ic &
per
form
ing
arts
pri
nt b
ooks
Mus
ic &
per
form
ing
arts
e-b
ooks
Philo
soph
y &
relig
ion
prin
t boo
ksPh
iloso
phy
& re
ligio
n e-
book
s
Phys
ical
edu
catio
n &
recr
eatio
n pr
int b
ooks
Phys
ical
edu
catio
n &
recr
eatio
n e-
book
s
Phys
ical
scie
nces
pri
nt b
ooks
Phys
ical
scie
nces
e-b
ooks
Polit
ical
scie
nce
prin
t boo
ksPo
litic
al sc
ienc
e e-
book
s
Psyc
holo
gy p
rint
boo
ksPs
ycho
logy
e-b
ooks
Soci
olog
y pr
int b
ooks
Soci
olog
y e-
book
s
E-book usage compared to print usage
Section requests Local checkouts Resource sharing requests
4 16 13
3 8 5 4 9 6 4 10 11 22
2 9 10 17 15 31
8 12 22 19
104
196
134
56
82
23
193
85
114 113
171
121 127
204
138
85
238
153 153
48
133
95
160
0.0
50.0
100.0
150.0
200.0
250.0
300.0
Average number of uses per 100 available titles
Turnover rate of print books Turnover rate of e-books
21%
35% 30%
37% 36%
56% 61%
41%
35% 35%
31% 31%
24%
28%
37% 29%
32% 28% 31%
17%
11%
2% 4% 2% 3%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Students Faculty E-bookholdings
E-bookusage
E-book usedtitles
Print bookholdings
Print bookcheckouts
Book holdings and usage statistics vs. user distribution per discipline
AH SS STEM MD
