Nobody likes being shown up. From Bob Luddy at spectator.org:
To do so, Sowell compares New York City’s charter schools to its public ones. For example, Success Academy (47 New York City schools) and KIPP Academy (15 NYC schools), both public charter schools, have established the best K-12 schools in Harlem and have demonstrated the ability to successfully educate minority students. These charter schools have conclusively proven that minorities and underprivileged students can be educated to the highest standards. This extraordinary success is based on test data from the state of New York and is achieved despite large class sizes of around 30 and fewer financial resources than traditional public schools.
Charter Schools: Educating for Excellence
These charter schools require a high level of discipline from every student and a focus on primary academics, including mathematics, history, science, logic, writing, and thinking skills. Importantly, in these schools there is more time to teach. This means students spend more time on task than those in traditional public schools.
In Harlem, charter schools are often located in the same building as traditional public schools. Sowell compares test data from these schools, which jointly house traditional public school students and charter school students.