60 · ARL Statistics 2006–2007

Analysis of Selected Variables of University Libraries, 2006–2007

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 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.

Category High Mean Median Low Number of

Libraries

Reporting

Professional Staff as a percent of Total Staff 59.35 32.18 30.82 19.86 113

Support Staff as a percent of Total Staff 69.31 46.63 47.37 12.77 113

Student Assistant Staff as a percent of Total Staff 67.38 21.19 20.65 3.32 113

Ratio of Professional to Support Staff (excluding Student

Assistant Staff)

3.54 0.77 0.66 0.34 113

Ratio of Items Loaned to Items Borrowed 5.89 1.45 1.28 0.22 113

Serials Expenditures as a percent of Total Library Materials

Expenditures

88.14 68.37 70.13 19.07 112

Monograph Expenditures as a percent of Total Library

Materials Expenditures

42.21 22.28 20.87 5.97 112

Total Library Materials Expenditures as a percent of Total

Library Expenditures

62.21 42.70 42.75 26.17 113

Contract Binding as a percent of Total Library Expenditures 1.95 0.61 0.56 0.16 113

Salary &Wages Expenditures as a percent of Total Library

Expenditures

60.29 44.78 45.12 30.08 113

Other Operating Expenditures as a percent of Total Library

Expenditures

28.50 11.90 10.86 2.54 113

Unit costs of Monographs (per volume) 122.59 55.82 54.51 5.58 101

Unit costs of Serials (per title) 543.42 192.29 171.70 73.61 101

Library Expenditures per Faculty 50,560.77 17,632.13 15,234.74 7,055.29 113

Library Expenditures per Full-Time Student 6,893.22 1,315.76 995.85 444.87 113

Library Expenditures per Full-Time Graduate Student 18,030.94 5,614.00 5,108.62 2,252.82 113

Library Expenditures per Full-Time User 5,949.11 1,208.48 931.32 423.47 113

Library Expenditures per User 5,865.27 1,045.54 789.90 355.46 113

Analysis of Selected Variables of University Libraries, 2006–2007

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 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.

Category High Mean Median Low Number of

Libraries

Reporting

Professional Staff as a percent of Total Staff 59.35 32.18 30.82 19.86 113

Support Staff as a percent of Total Staff 69.31 46.63 47.37 12.77 113

Student Assistant Staff as a percent of Total Staff 67.38 21.19 20.65 3.32 113

Ratio of Professional to Support Staff (excluding Student

Assistant Staff)

3.54 0.77 0.66 0.34 113

Ratio of Items Loaned to Items Borrowed 5.89 1.45 1.28 0.22 113

Serials Expenditures as a percent of Total Library Materials

Expenditures

88.14 68.37 70.13 19.07 112

Monograph Expenditures as a percent of Total Library

Materials Expenditures

42.21 22.28 20.87 5.97 112

Total Library Materials Expenditures as a percent of Total

Library Expenditures

62.21 42.70 42.75 26.17 113

Contract Binding as a percent of Total Library Expenditures 1.95 0.61 0.56 0.16 113

Salary &Wages Expenditures as a percent of Total Library

Expenditures

60.29 44.78 45.12 30.08 113

Other Operating Expenditures as a percent of Total Library

Expenditures

28.50 11.90 10.86 2.54 113

Unit costs of Monographs (per volume) 122.59 55.82 54.51 5.58 101

Unit costs of Serials (per title) 543.42 192.29 171.70 73.61 101

Library Expenditures per Faculty 50,560.77 17,632.13 15,234.74 7,055.29 113

Library Expenditures per Full-Time Student 6,893.22 1,315.76 995.85 444.87 113

Library Expenditures per Full-Time Graduate Student 18,030.94 5,614.00 5,108.62 2,252.82 113

Library Expenditures per Full-Time User 5,949.11 1,208.48 931.32 423.47 113

Library Expenditures per User 5,865.27 1,045.54 789.90 355.46 113