New Stats on Immigration

A new look from Yale at the number of undocumented (a.k.a. illegal) immigrants. 

An excerpt:

Our original idea was just to do a sanity check on the existing number,” says Edward Kaplan, the William N. and Marie A. Beach Professor of Operations Research at the Yale School of Management. “Instead of a number which was smaller, we got a number that was 50% higher. That caused us to scratch our heads.”