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://nces.ed.gov/nationsreportcard//pdf/studies/2006460.pdf
This examination of National Assessment of Educational Progress (2003) scores from 150 public charter schools and 6,764 traditional schools finds fourth-graders in traditional schools scored an average of 5.2 points better in reading than students in charters. It also shows that the traditional school students scored 5.8 points better in math than students in the public charters. The authors caution that such results could be influenced by factors other than charter school quality, including the length of time that students in the charter school sample will have spent in the charter school system, the possible attraction of parents to charter schools because they felt that their children were not well served by public noncharter schools, and the extent to which parents provide differential amounts of support and encouragement for academic achievement.
Date: 2006
Source: National Center for Education Statistics (NCES)
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