Taking his figures as accurate (always a stretch, but...),
Once again TK shows his 3rd grade reading level. The stats come from PJ's own link .
Charter Schools vs Public school performance " The most rigorous studies conducted to date have found that charter schools are not, on average, better or worse in student performance than the traditional public school counterparts. This average result, however, obscures tremendous variation between individual charter schools and charter schools in different states.
PJ should use more current information. This study is from almost 20 years ago. NYC charter schools outperform the conventional schools by wide margins. Indiana also outperforms.