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.educationalpolicy.org/pdf/KIPP.pdf
Using school-level Stanford 9 and Stanford 10 (SAT) data, this study finds that 27 KIPP charter middle schools have achieved large and significant gains. The report found that 5th-grade cohorts at KIPP schools post substantially greater academic gains on the SAT than what is considered normal, a finding consistent with prior research on KIPP schools. Schools administering the tests first in the fall with a follow-up test in the spring enjoyed a mean gain of 10.1 in reading, 10.9 in language, and 17.4 in mathematics. Schools that first administered the test in the fall and then again the following fall recognized score gains of 7.5 in reading, 9.1 in language, and 11.6 in mathematics. KIPP cohorts experienced average gains of 9 to 17 points across all tests. Students are in KIPP schools at least nine hours a day, compared with fewer than seven hours in regular public schools. Three weeks of summer school is mandatory.
Date: 2005
Source: Educational Policy Institute
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