Harvard's Innovation Lab at their law library was working with this type of data, I believe...
Try reaching out to them directly:

Tom Blake
Digital Projects Manager
Boston Public Library
700 Boylston St.
Boston, MA 02116
617 859-2039
Free To All

-----Original Message-----
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Tom Cramer
Sent: Tuesday, June 17, 2014 11:27 AM
To: [log in to unmask]
Subject: Re: [CODE4LIB] best practices for keeping / using library circ data

This email provoked zero responses on list. Was my timing off, is it a poorly framed question, or are people just not doing much in this realm? (By resending, I'm controlling for the timing factor...) 

- Tom

On Jun 7, 2014, at 3:20 AM, Tom Cramer wrote:

> I'm looking for best practices for keeping and using library usage data--real life examples of libraries gathering and using things like circulation data or e-resource traffic statistics to inform service and strategy decisions while safeguarding patron privacy. 
> I'm less interested in operational logging for security / authorization purposes, and more interested in things like gathering data to make recommendations (people who checked this out also checked this out...), collection management / licensing / deaccessioning decisions, or overall library / collection usage reporting--especially if the data are tracked and used at more than a gross level (i.e., faculty v. graduate v. undergrad usage). 
> What usage data do you keep that may be correlated to patron identity?
> How do you use it? 
> What do you do to anonymize / aggregate / cleanse / protect patron privacy? 
> Does anyone have an approach that they regard as state of the art? Or pointers to previous work done in this space? 
> Thanks in advance, 
> - Tom