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.michigan.gov/documents/mde/Item_I1_217074_7.pdf
A new study finds that public charter schools are helping close the achievement gap in Michigan. Recent state data reveals that economically disadvantaged, African-American, and Hispanic/Latino charter students exceeded their host district peers by 4-5 percentage points in both math and English Language Arts. African-American students outperformed their peers statewide by one point in math and nearly 1.5 points in English Language Arts. Charter students with disabilities exceeded their host district peers by 9 points in math and 11 points in English Language Arts. Charter schools open seven or more years were 8 percentage points higher than schools open three or fewer years in both ELA and math (grades 3-8 combined). Seventy-four percent of charters made adequate yearly progress, compared to 68 percent of host district schools. The study also found that charters achieved impressive academic gains with less resources. During the 2005-06 school year, total charter school revenues lagged their host district revenues by an average of $2,289 per pupil.
Date: 2007
Source: Michigan Department of Education
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