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Aguilar's Ratio of Borrowings to Holdings
- Same as Bonn's Use Factor but using interlibrary loan statistics.
- Generated in the same way as Mills' percentage of expected use.
- Call Number % of borrowings / Call Number % of holdings = Ratio of Borrowings to Holdings (RBH)
- Compute the mean (average) of RBH.
- Compute standard deviation from the mean.
- "Those that are one standard deviation below the mean can be defined as underused; those one standard deviation above the mean as overused." (Aguilar, p. 20)
- Provides means of triangulation for use factor / percentage of expected use.
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