Twelve studies find that overall gains in charter schools are larger than other public schools; four find charter schools’ gains higher in certain significant categories of schools; six find comparable gains; and, four find that charter schools’ overall gains lagged behind traditional schools.
Source: Charter School Achievement: What We Know, July 2005 Update
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Download: 
http://www.usc.edu/dept/education/cegov/CSI_08_v6.pdf
This second annual report on public charter schools in California draws on a quantitative database of multiple measures of schools, staff, and performance and finds that the public charter movement is growing and maturing. The rates of improvement of California's public charter schools continue to outpace those of non-charter public schools. Public charters have shown an improvement in their state rankings (API Composite), indicating improvement in overall academic achievement. Between 2004 and 2007, the number of public charter schools receiving the highest rankings went up by 3.8 percent (from 19.5 percent to 23.3 percent) and the public charter schools in the lowest rankings decreased by 3.9 percent (from 27.8 percent to 23.9 percent). Demographically, the state's public charter schools have higher proportions of African-American and white students, while non-charter public schools have higher proportions of Asian and Hispanic students.
Date: 2008
Source: University of Southern California
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