Post on 29-Nov-2014
description
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.