DDA & STEM @UNT

What we have learnedKaren R. Harker, MLS, MPH

Collection Assessment LibrarianUNT 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.

Discovery

Collection

STEM in the Print Collection

STEM16%All Others

84%

% 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 lect ion

Total STEM12%

All Others88%

DDA T i t les P ur chased

Total STEM13%

All Others87%

DDA % of C osts

Budg

eted f

or Mon

ograp

hs

In DDA C

ollect

ion

Of DDA P

urcha

sed

Of DDA E

xpen

se0%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% PhysicsMathematics

Engineering

ChemistryBiology

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      

What was Purchased?

Library Science

Mathematics

PhysicsBiology

RRRatio of Purchases to

Collection

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 Purchases to Collection

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, AddictionsCriminal Justice

PhilosophyPublic Administration

EducationDocs & Legal MaterialsCommunication Studies

Radio TV FilmNative American Studies

PhysicsSociology & Gerontology

AnthropologyLinguistics & Technical Writing

PsychologyLearning Technologies

MusicArt

Merchandising & Hospitality ManagementChemistry

Speech & HearingCollege of Engineering

Library & Information Sciences

Purc

hase

s to

Colle

ctio

ns R

atio

- Lo

w to

Hig

hRatio of Purchases to

Collection

DDA Usage

Titles Used4%

Titles Not Used96%

DDA

Print

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. 23Human 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. 9Drupal : 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. 7Search 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 Ti

tles

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

249172

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-Rental4-Rental

5-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

OwnedAmount 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. Harkerkaren.harker@unt.edu

940-565-2688BeingAndLibrarianship.blogspot.com

Questions I have For questions you might have