John McDonaldClaremont Colleges Library

Oberlin Group Statistics

Claremont Colleges Library

Claremont Colleges Library

What and why• Check validity of the measures• Are we all measuring the same thing?

• Test the reliability of the variables• Are we all measuring consistently from year to

year?

In order to:• Refine our measures collecting process

• Provide stronger definitions of measures

Claremont Colleges Library

Oberlin Group Data

• 6 years of statistics

• From 2004 through 2009

• All 80 schools represented, though not all years for all

schools

• 66 relatively consistent variables collected

Claremont Colleges Library

Transform data• Transposed Excel spreadsheet

• Import into database

• Add year variable

• Add US News Ranking for 2009

• Export to STATA

• Run analysis

Claremont Colleges Library

Claremont Colleges Library

Statistics

• Look for Outliers

• Test Rank order correlation

• Build regression model

Claremont Colleges Library

2003 2004 2005 2006 2007 2008 2009 20100

500

1000

1500

2000

2500

3000

3500

College Endowment

Claremont Colleges

Claremont Colleges Library

2003 2004 2005 2006 2007 2008 2009 20100

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

Undergrad FTEAtlanta University Center

Claremont Colleges

Claremont Colleges Library

0 50 100 150 200 250 300 350 400 450 5000

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

Gro

up T

rans

actio

ns

(Att

enda

nce)

Group Transactions

Claremont Colleges Library

500 1000 1500 2000 2500 3000 3500 4000 45000

50

100

150

200

250

300

350

400

Facu

lty F

TE

Undergraduate FTE

Claremont Colleges Library

2003 2004 2005 2006 2007 2008 2009$0.00

$100,000.00

$200,000.00

$300,000.00

$400,000.00

$500,000.00

$600,000.00

$700,000.00

Electronic Expenditures

Claremont Colleges Library

50 100 150 200 250 300 350 4000

10000

20000

30000

40000

50000

60000

70000

Circ

ulati

on (F

acul

ty)

Faculty FTE

Smith College

Simmons

Claremont Colleges Library

$1,000,000.00

$2,000,000.00

$3,000,000.00

$4,000,000.00

$5,000,000.00

$6,000,000.00

$7,000,000.00

$8,000,000.00

$9,000,000.00

$10,000,000.00

$11,000,000.000

10000

20000

30000

40000

50000

60000

How

man

y el

ectr

onic

sub

scrip

tions

do

you

rece

ive?

Total Library Expenditures

Claremont Colleges Library

Rank Order Correlation of Undergraduate FTE

FTE 2004 2005 2006 2007 2008 2009

2004 1.000         

2005 0.996 1.000       

2006 0.991 0.995 1.000     

2007 0.990 0.994 0.995 1.000   

2008 0.985 0.990 0.992 0.991 1.000 

2009 0.982 0.985 0.987 0.989 0.991 1.000

Claremont Colleges Library

Ejournals 2004 2005 2006 2007 2008 2009

2004 1.000         

2005 0.885 1.000       

2006 0.760 0.819 1.000     

2007 0.467 0.373 0.476 1.000   

2008 0.447 0.390 0.475 0.952 1.000 

2009 0.483 0.433 0.499 0.894 0.911 1.000

Rank Order Correlation of Total Ejournals

Claremont Colleges Library

Does high group attendance impact reference transactions? [YES]

- R-squared = 0.2709- Group Trans = t= 5.92 P>|t| = 0.000 - Librarian FTE = t= 3.21 P>|t| = 0.000

Or impact circulation (students)? [NO]- R-squared = 0.4145 - Total Volumes = t= 14.42 P>|t| = 0.000 - Undergrad FTE = t= 5.16 P>|t| = 0.000

- Total Volume = t=11.47 P>|t| = 0.000

Claremont Colleges Library

Does high gate count result in high circ? - R-squared = 0.2663, - Gate Count = t=8.74 P>|t| = 0.000 - Undergrad FTE = t=3.62 P>|t| = 0.000

Does circ depend on volume count? - R-squared = 0.4539 - Gate Count = t= 6.39 P>|t| = 0.000 - Undergrad FTE = t= 2.16 P>|t| = 0.031

- Total Volume = t=11.47 P>|t| = 0.000

Claremont Colleges Library

Just for fun!

Predicting US News & World Report rankings

Claremont Colleges Library

US News Ranking College

1 Williams College2 Amherst College3 Swarthmore College4 Wellesley College4 Middlebury College6 Bowdoin College8 Carleton College8 Davidson College

10 Haverford College11 Vassar College13 Wesleyan University14 Grinnell College14 Washington and Lee University

Claremont Colleges Library

Source SS df MS Number of

obs = 59

Model29073.3

1 3 9691.10 F( 3,55) = 50.54

Residual10546.8

3 55 191.76 Prob > F 0

Total39620.1

4 58 683.11 R-squared 0.7338

Adj R-

squared 0.7193

Root MSE 13.848

US News Rank Coef.Std. Err. t P>t

[95% Conf. Interval]

College Endowment -0.0263 0.0068 -3.87 0.000 -0.0400 -0.0127

Total Volume Count 0.0000 0.0000 -5.90 0.000 0.0000 0.0000

Reference Transactions 0.0580 0.0163 3.56 0.001 0.0254 0.0907

_cons 76.9345 4.5533 16.90 0.000 67.8094 86.0595

Claremont Colleges Library

Looking at just library-specific dataTotal Library Expenditures Professional Staff Salaries Total Collection Volume Count Total Books & Bound Volumes Added Books added by purchase Total journals Print journals Ejournals ILL returnables borrowed for you ILL nonreturnables provided to you Circulation (Student)circulation (Faculty)Reference transactions (typical week)Group Transactions Group Transactions (Total attendance)Gate count (Typical week)

Claremont Colleges Library

Source SS df MS Number of obs = 58

Model 28504.809 4 7126.202 F(4,336) = 33.26Residual 11355.260 53 214.250 Prob > F 0Total 39860.069 57 699.299 R-squared 0.7151

Adj R-squared 0.6936

Root MSE 14.6370

US News Rank Coef. Std. Err. t P>|t|[95% Conf. Interval]

Total Library Expenditures -0.00001 0.000 -3.950 0.000 -0.00001 0.00000Total Collection Volume Count -0.00002 0.000 -2.020 0.049 -0.00005 0.00000ILL Nonreturnables Borrowed for You -0.00291 0.001 -3.290 0.002 -0.00468 -0.00114Group Transactions (Attendance) 0.00501 0.001 3.410 0.001 0.00207 0.00796_cons 85.04805 5.104 16.660 0.000 74.81158 95.28453

Claremont Colleges Library

What affects our student’s view of us?

How much you spend.How much you have.How much you can get.How much you don’t help them.