The OverDrive APIs do give a total checkout count although it is hard for me to tell if these are all time checkouts across all libraries or if they are specific to my library.  Based on the numbers I'm guessing that they are for all libraries.  Perhaps some sort of normalization could be done.

- Mark

On 10/14/2013 4:23 PM, Jay Roos wrote:
That is a good point. We could somehow incorporate copy counts for eBooks, but that would not likely reflect a decline in popularity as there is no motivation to weed copies.

On Mon, Oct 14, 2013 at 4:18 PM, Joe Atzberger <> wrote:
Notably, boosting by holdings count will diminish the results for an eBook of the same popular title, assuming that one or zero "holdings" are associated with the eBook record (vs. many with the print version).  The same would be true for any electronic content, unless you adopted Marc's approach of tracking number of checkouts.

In our case, we use 3rd party commercial popularity data for the boost.