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.auditor.leg.state.mn.us/ped/pedrep/charterschools.pdf
This report from Minnesota’s Legislative Auditor shows mixed results for the state's public charter schools. Only one-half of public charter schools made AYP in 2007, while more than two-thirds of district schools made AYP during this same time period. The results, however, varied by region. For example, in Minneapolis and St. Paul, where public charter schools are concentrated, a larger percentage of public charter schools made AYP than district schools. Fifteen percent of public charter schools performed better on state assessments than district schools with similar demographics. More than one-half of public charter schools performed worse than comparable district schools on the state math exam and nearly 40 percent performed worse on the reading exam. When accounting for student mobility rates (in addition to region, percentage of minority students, and percentage of students eligible for free or reduced-price lunch), the differences in performance diminished significantly.
Date: 2008
Source: Office of the State Legislative Auditor, State of Minnesota
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