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/OP145.pdf
Using over ten years of school-level longitudinal data in Michigan, this paper explores the impact of charter competition on student achievement and tests the hypothesis that competition from charter schools improves the efficiency of traditional public schools. The author finds that charter competition has an increasingly negative impact on student achievement and school efficiency in the state's traditional public schools.
Date: 2007
Source: National Center for the Study of Privatization in Education
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