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DDA & STEM @UNT
What we have learned
Karen R. Harker, MLS, MPHCollection Assessment Librarian
UNT Libraries
Key Players
The UNT Libraries have made a concerted effort towards building a useful collection of electronic resources. As of this year, we have successfully “converted” 98% of all journal subscriptions to online only. Now, we are looking at monographs.
Baker & Taylor is our primary print vendor, and their Patron-Driven or Demand-Driven Acquisitions program is the result of a collaboration with ebrary, a major electronic book provider.
WHY?
This is an important question. Why go down this path? Why set aside precious funding for collections to “experiment”? Why should we cross this road?
Well the simple answer is…to see what’s on the other side. How would Demand-Driven Acquisitions work for UNT?
DDA vs. Print
DDA vs. Other Ebooks
Selected a DDA plan
Created an approval plan
Uploaded the MARC records
Discovery Collection
Selection Criteria
Page Views
Minutes
DownloadCopy or Print
Approval Plan
Upload MARC Records
Discovery Collection
This became our Discovery Collection.
Based on approval plan for print monographs.Capped the cost of any item at $100.
Note that there is no indication to the user that any particular title is not owned by the UNT Libraries.
Wait & See
Weekly Updates
MARC records in two files: the non-purchased titles (Discovery
Collection) and the purchased titles (DDA collection).
Spreadsheet of purchased titles. All data from files - exported into Access
database Track purchases by fund, by week, and by
publisher.
Dis
covery
C
olle
ctio
n
STEM in the Print Collection
STEM16%
All Others84%
% of Budget for Monographs
STEM19%
All Others81%
% of Print Books
STEM8%
All Others92%
DDA Discovery Col-lection
Due to $100 cap?
Fund Name Budgeted % Discovery %Physics
Learning Technologies
Communication Studies
Biology
Foreign Language, Other
Business
Merchandising & Hospitality Management
Dance & Drama
Docs & Legal Materials
Journalism
Native American Studies
Public Administration
Foreign Language, French
Library & Information Sciences
Philosophy
Foreign Language, Spanish
Linguistics & Technical Writing
Criminal Justice
Geography
Speech & Hearing
Anthropology
Rehabilitation, Social Work, Addictions
Radio TV Film
Sociology & Gerontology
College of Engineering
Psychology
Chemistry
Political Science
Interdisciplinary
Economics
Art
Music
Mathematics
History
English
Education
Discovery Collection vs. Print Book Budgets
Fund Name Budgeted %Physics
Learning Technologies
Communication Studies
Biology
Foreign Language, Other
Business
Merchandising & Hospitality Management
Dance & Drama
Docs & Legal Materials
Journalism
Native American Studies
Public Administration
Foreign Language, French
Library & Information Sciences
Philosophy
Foreign Language, Spanish
Linguistics & Technical Writing
Criminal Justice
Geography
Speech & Hearing
Anthropology
Rehabilitation, Social Work, Addictions
Radio TV Film
Sociology & Gerontology
College of Engineering
Psychology
Chemistry
Political Science
Interdisciplinary
Economics
Art
Music
Mathematics
History
English
Education
Low
to H
igh
These are over-represented.
These are under-represented.
What did our
patrons select?
2/4 2/18 3/3 3/17 3/31 4/14 4/28 5/12 5/26 6/9 6/230
20
40
60
80
100
120
Spring Break
Late Semes-ter Surge of Titles Pur-
chased
February-12 March-12 April-12 May-12 June-12$0
$10,000
$20,000
$30,000
$40,000
$50,000
$60,000
$70,000
$80,000
$90,000
$100,000
Shrinking Debit Ac-
count
2/4 2/112/182/25 3/1 3/3 3/103/173/243/31 4/7 4/144/244/28 5/5 5/125/195/26 6/2 6/146/166/23 7/20
2
4
6
8
10
12
14
Sporadic STEM Purchases
Greater Rate of STEM Purchases
Total STEM8%
All Others92%
Discov ery C ol lec t ion
Total STEM12%
All Others88%
DDA T i t les P urchased
Total STEM13%
All Others87%
DDA % of C osts
Budg
eted
for M
onog
raph
s
In D
DA Col
lect
ion
Of DDA
Purc
hase
d
Of DDA
Expe
nse
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
% STEM
STEM Collection by DDA
Titles Available Titles Purchased $ Purchases0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100% Physics
Mathematics
Engineering
Chemistry
Biology
Distributions of STEM by Subject
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%Physics
Mathematics
Geography
Engineering
Chemistry
Biology
Fund Name Budgeted % DDA % Purchased %Physics Learning Technologies Communication Studies Biology Foreign Language, Other Business Merchandising & Hospitality Management
Dance & Drama Docs & Legal Materials Journalism Native American Studies Public Administration Foreign Language, French
Library & Information Sciences
Philosophy Foreign Language, Spanish
Linguistics & Technical Writing
Criminal Justice Geography Speech & Hearing Anthropology Rehabilitation, Social Work, Addictions
Radio TV Film Sociology & Gerontology College of Engineering Psychology Chemistry Political Science Interdisciplinary Economics Art Music Mathematics History English Education
Wh
at w
as P
urch
ase
d?
Library Science
Mathematics
Physics
Biology
RRR
atio
of P
urch
ase
s to
Colle
ction
Diseased % Exposed %
So how can you take the different distributions into consideration when comparing groups?
Well, in public health, there is a statistic called relative risk that weights the rate of those with a disease by the rate of those exposed. Thus, the risk is relative to the exposure.
RRPurchased % DDA %
Ratio
of P
urch
ase
s to
Colle
ction
We can do the same thing here by weighting the percentage purchased (diseased) with its distribution in the Discovery Collection.
Thus, the risk of a title in a particular subject being purchased is relative to the distribution of that subject in the collection.
Lower than Expected Selection
Greater than Expected Selection
Just Right!
JournalismForeign Language, FrenchForeign Language, Spanish
Dance & DramaForeign Language, Other
MathematicsPolitical Science
EconomicsBusinessHistory
GeographyInterdisciplinary
BiologyEnglish
Rehabilitation, Social Work, Addictions
Criminal JusticePhilosophy
Public AdministrationEducation
Docs & Legal MaterialsCommunication Studies
Radio TV FilmNative American Studies
PhysicsSociology & Gerontology
Anthropology
Linguistics & Technical Writing
PsychologyLearning Technologies
MusicArt
Merchandising & Hospitality Management
ChemistrySpeech & Hearing
College of Engineering
Library & Information Sciences
Purc
hase
s to
Colle
ctio
ns
Rati
o -
Low
to H
igh
Ratio
of P
urch
ase
s to
Colle
ction
DDA Usage
Titles Used4%
Titles Not Used96%
DDA
DDA Had More Usage than Print…
2012 YTD
Titles Used11%
Titles Not Used89%
Titles Used7%
Titles Not Used93%
…and More Usage Than EBSCO, but…
EBSCO
2012 YTD
Titles Used11%
Titles Not Used
89%
DDA
Print1,477,131
EBSCO47,539
DDA19,406
…DDA Had Much Fewer Titles
Available
Titles Used >
144%Titles
Used Once56%
Multiple Usage Similar to EBSCO
DDA
EBSCO
2012 YTD
Titles Used > 147%
Titles Used Once53%
Usage of STEM: DDA vs. Print
% User Sessions % of All Circulations0%
2%
4%
6%
8%
10%
12%
14%
16%
Physics
Mathematics
Geography
Engineering
Chemistry
Biology
Title# User Sessions
Computer architecture : a quantitative approach / John L. Hennessy, David A. Patterson
39
HTML & CSS : design and build web sites / Jon Duckett. 23
Human parasitology / Burton J. Bogitsh, Clint E. Carter, Thomas N. Oeltmann.
18
Municipal solid waste management : processing, energy recovery, global examples.
13
Physical properties of macromolecules / Laurence A. Belfiore.
10
Drupal 7 bible / Ric Shreves, Brice Dunwoodie. 9
Drupal : the guide to planning and building websites / Cindy McCourt.
8
Infrared and raman spectroscopy : principles and spectral interpretation.
7
Chromatography : concepts and contrasts / James M. Miller. 7
Search engine optimization secrets / by Danny Dover. 7
Most Used STEM Titles
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 24 29 32 37 39 410
50
100
150
200
250
300
350
Usage Sessions
# o
f T
itle
s
The Long Tail of DDA Usage
1 “Usage” = 10 Page-Views Open 10 Minutes
Download or Print Copy & Paste
Rental Optio
ns
But which model would be the most effective use of funds? Used Excel’s Scenario
Analysis Set up different
“scenarios” certain variables were
changed outcomes were
calculations based on these different values
Set up 6 scenarios: the current simple
purchase model rental models from 1 to
5 rentals.
Variables changed for each scenario: the number of titles
owned the % of the purchase
price NOTE: % of purchase
price includes the rental costs
Outcomes Total number of titles
owned Total costs
What if…? ScenariosScenario Summary
Current Model One Rental Two Rentals Three Rentals Four Rentals Five Rentals
Changing Cells:
1 Usage Only
# Titles Owned
293 0 0 0 0 0
2 Usages Only 226 226 0 0 0 0
3 Usages Only 152 152 152 0 0 0
4 Usages Only 77 77 77 77 0 0
5 Usages Only 45 45 45 45 45 0
>5 Usages 127 127 127 127 127 127
1 Usage Only
% of Purchase Price
100% 10% 10% 10% 10% 10%
2 Usages Only 100% 110% 20% 20% 20% 20%
3 Usages Only 100% 110% 120% 30% 30% 30%
4 Usages Only 100% 110% 120% 130% 40% 40%
5 Usages Only 100% 110% 120% 130% 140% 50%
>5 Usages 100% 110% 120% 130% 140% 150%
Result Cells:
Total Titles Owned 920 627 401 249 172 127
Total Costs $58,210.19 $44,654.25 $33,803.16 $25,646.31 $21,485.40 $18,888.36
920
627
401
249
172
127
Cur-rent
1-Rental
2-Rental
3-Rental 4-
Rental 5-Rental
How Many Titles Would We Have Owned?
$58,210
$44,654
$33,803
$25,646
$21,485$18,888
Current
1-Rental
2-Rental
3-Rental
4-Rental5-Rental
How Much Would We Have Spent?
One Rental Two Rentals Three Rentals Four Rentals Five Rentals0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
Growing Gap Between Amount Spent and
Number of Titles Owned
Amount We Would Have
Spent
# Titles We Would Have Owned
So, what did we learn?
DDA Shows Promise
The titles are being used quite similarly to print and other ebook collections.
Align Approval Plan With Needs and Usage
Image from Tony Armstrong (Flickr: midlander1231)
Adjust Purchase Model
Regularly Review Data
Questions
Compare with print & other ebook providers: Publisher BISAC Categories
Compare patrons’ selections with librarians’ selections
Long-term usage trends Can this model be win-win
for both publishers and libraries?
Karen R. [email protected]
940-565-2688BeingAndLibrarianship.blogspot.com
Questions I have For questions you might have
