KIPP and Its Critics Are Both Right
I was a social scientist before I became a teacher so I was excited to read that Mathematica had analyzed "late arrivals" who attended KIPP. That seemed to be an inspired methodology for determining whether KIPP "creams" by excluding the most difficult-to-educate kids. I thought that KIPP did not admit students after the year began, but if they had a big enough sample to compare the characteristics of KIPP students who arrive in October, for instance, with students who first enter neighboring schools at that time, we would have real evidence!
Reading the study and its definitions, I learned that Mathematica attempted no such thing. Sure enough, KIPP does not admit students in the middle of the year.
As with their previous research, Mathematica was impeccable in fulfilling the purpose of their study. Their methodology showed that 22 KIPP schools have demonstrated remarkable fidelity in implementing their model, while reducing "creaming" as much as is possible for a system where poor families must apply, and volunteer to meet much higher standards. The highly-respected