I'm curious as to whether or not any departments ever attempt to evaluate their own admissions decisions. It seems quite plausible to do for any college or graduate program, but I've never heard of it done. I have in mind some kind of data analysis comparing student success in the program or beyond with variables from the application. 

I understand some might not like the idea, but as noisy as admissions are, I was wondering if schools ever reflect on their own decisions and attempt to identify strengths and weaknesses?