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.csrq.org/documents/ESPCSRQReport-Full_000.pdf
This document is the product of researchers screening 940 studies on seven different educational management organizations to look for proof of whether the programs produce gains in student achievement. Only nine studies met the group's strict definition for scientific quality and all of them focused on Edison Schools, the for-profit company that operates 157 schools, including many charters, around the country. Edison, however, only received a rating of "moderate" by the group's standards for "evidence of positive overall effects." No providers earned the top two ratings: "moderately strong" and "very strong." Researchers could not find any studies to show whether some of the organizations' models improved student achievement, but none of the organizations were found to have a negative impact on schools. The seven models operate in 350 schools, which represent 60 to 65 percent of all the schools across the country that use such outside groups.
Source: American Institutes for Research
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