But a recent study of charter school performance in 16 states found that nearly 40 percent of charter schools achieved less academic growth than comparable traditional district schools. (educationnext.org)
16 academic studies have been published on charter school performance since 2010, including four national studies and 12 regional studies from throughout the country. (greendot.org)
Analysts there created statistical «virtual twins,» enabling them to compare charter school performance to that of its «virtual» traditional public school. (nsba.org)