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.ncspe.org/publications_files/OP104.pdf
Controlling for student background, this study examines the effect of charter schools on Texas' traditional school achievement. Researchers find a positive and significant effect of charter schools on traditional public school student outcomes. "Charter penetration" in a community is found to be effective in raising performance of students remaining behind in traditional public schools, especially when students are at schools that were performing below average. The authors suggest their data support the move to expand school choice to generate systemic gains.
Date: 2005
Source: National Center for the Study of Privatization in Education
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