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.ade.state.az.us/charterschools/info/CharterSchoolStatusMainReport3-15-99.pdf
The Morrison Institute for Public Policy is located on Arizona State University's main campus. They have completed several studies of charter schools, including an Arizona charter schools progress report completed for the state.
Date: 2002
Source: Morrison Institute for Public Policy
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