38 · ARL Statistics 2012–2013

Analysis

of

Selected Variables

of

University Libraries, 2012–2013

The percentages and ratios below are select indicators that describe the condition of ARL university libraries. The

high and low figures indicate the range, while the mean and median indicate the central tendency of the distributions

for ARL university libraries. Note that a distribution is normal when the mean and the median figures are

If the mean is larger than the median, then the distribution is positively skewed, and if the opposite is true, the

distribution is negatively skewed.

Category

The percentages and ratios below are select indicators that describe the condition of ARL university libraries. The high and lowidentical.

figures indicate the range, while the mean and median indicate the central tendency of the distributions for ARL university libraries.

Note that a distribution is normal when the mean and the median figures are identical. If the mean is larger than the median then the

distribution is positively skewed, and if the opposite is true the distribution is negatively skewed.

High Mean Median Low Number of

Libraries

Reporting

Professional Staff as a precent of Total Staff

62.26 36.79 36.36 21.78 115

Support Staff as a precent of Total Staff

69.48 42.91 43.10 12.87 115

Student Assistant Staff as a precent of Total Staff 65.35 20.49 20.67 0.47 114

Ratio of Professional to Support Staff (excluding Student Assistant

Staff)

4.40 0.97 0.84 0.40 115

Ratio of Items Loaned to Items Borrowed

4.25 1.37 1.20 0.19 114

Total Library Materials Expenditures as a precent of Total Library

Expenditures

62.95 46.24 46.93 28.21 115

Salary and Wages Expenditures as a precent of Total Library

Expenditures

59.38 42.98 42.58 31.39 115

Other Operating Expenditures as a precent of Total Library

Expenditures

33.22 10.79 10.35 0.75 115

Library Expenditures per Faculty 69,748.31 18,236.43 16,628.55 7,389.15 115

Library Expenditures per Full-Time Student

7,211.69 1,316.31 955.42 353.41 115

Library Expenditures per Full-Time Graduate Student

19,002.60 5,244.25 4,612.49 2,393.20 115

Library Expenditures per Full-Time User 5,888.94 1,207.63 897.48 339.23 115

Library Expenditures per User

5,821.72 1,054.61 763.64 246.91 115

Library Expenditures per PhD Awarded

300,363.09 60,653.02 50,479.56 15,461.50 115

Library Staff per PhD Awarded 4.08 0.56 0.45 0.16 115

Professional Library Staff per PhD Awarded

1.18 0.20 0.17 0.05 115