The authors claim that the improvement in student «quality» can not fully explain the growing effectiveness of charter schools in the state, although this claim is very hard to prove definitively. (educationnext.org)
At beginning of their sample period, the average effectiveness of charter schools was below that of traditional public schools. (educationnext.org)
And in Cambridge, school officials in 2005 mailed letters to 4,000 families questioning the academic effectiveness of a charter school that had yet to open. (educationnext.org)