Data mining with Rattle and R .... http://rattle.togaware.com/

Most librarians were probably not math majors, and are unlikely to be expert in statistics. But if you can work your way through the book, you may get enough insight into your data to ask good questions from a local Math department. No doubt some graduate student(s) can get a paper out of it, or at least some applied class project credit.

But if you don't understand what it is you are looking for, you probably won't coax them into figuring out what questions you ought to be asking. So start with the book.

While a free version is on the site, support the work by buying a hardcopy for the library ;>

You're not suggesting a complex open-source application that will require intensive work and special skills to implement to solve a basic task? You must be new around here.

I suggest you post your question to the code4lib mailing list. It's going to get you much more informed and practical advice. You might even find some people who already have a good workflow who will share their tools.

-Esme