Notes de l'éditeur

1. Conclusions from the cautionary tale: Phrase in terms of the banana story
2. *Read online - Can think of as in-library use*Download – can be thought of as a checkout*Combined these, but ignored all casual use – i.e. click in and click out never counted;Every use indicates true interest in the content: a click through saying I want to continue to view, or a copy command or a print command*The ability to eliminate casual usage (ie browsing) from EBL use data distinguishes it from all other e-resource use data that we’re aware of
3. *Length of book ownership had significant effect on number of uses and users per book*For simplicity, it was incorporated in to the response variables (i.e. uses per year, and unique users per year) *Books owned less than 6 months were ignored to avoid high use per year ratio due to a few uses in a short period of time— when the analysis was repeated with books owned at least 1 year – there was no affect on the pattern or strength of the effects
4. *In all subsequent slides user books from user selected collections are in blue, and those from preselected collections are in green*Overall Average number of uses per year in general quite high ≈ 6 per year *Average number of post-purchase uses per year is significantly greater for user-selected ebooks (2x as high) *Even though the total number of books (n) in the user selected set is greater, this has no effect on the result—these are PER BOOK averages, so each book in the user selected collection is used an average of 8.6x per year, andeach book the preselected collection is used an average of 4.3x per year*This result rejects the hypothesis rejects the hypothesis that users will select ebooks will be used less than pre-selected ebooks
5. *Pattern of greater use for user-selected books is consistent across all 5 libraries: 4 of 5 are significantly different based on non-overlapping 95% confidencec intervals*degree of difference varies from 1.75x to 4.5x
6. *This figure shows for the number of unique users per ebook per year for the overall user selected and preselected collections*The average user-selected ebook was used by a significantly greater number of different users per year (about 2x as many)*These data allow us to result rejects the hypothesis that users select books that are only of interest to themselves
7. *Here we see that pattern of wider use of user-selected ebooks is also consistent across the 5 libraries, with the same 4 libraries showingsignificantly wider useThe degree of this effect varies from 1.75x to 3.3 times more unique users per book per year in user-selected collections
8. *Print book collections are often assessed by the percentage of their books with 0 checkouts*Here we report the percentage of books with zero use in discrete collections formed under both acquisition models*In every case more than 90% of the books had been used at least once, and in 4 out of 5 libraries, fewer books went unused in the user driven collections*On average there were about 6x as many unused books in the pre-selected collections
9. *At a broad disciplinary level, 4 of 5 libraries had similar subject profiles for the collections built under the two acquisition models*For the one library (K) where the profiles appear to be different, the preselected collection seemed to over-emphasize Sci&Tech books vs their user selected collection
10. At a slightly more granular level, subject profiles of the two types of collections also appear to be similar
11. Same data in tabular form with a few additional classes included