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.ncspe.org/publications_files/OP128.pdf
Examining charter schools in Michigan over a five-year period, researchers have found that the state's charters have drawn approximately 20 percent of their population from private schools. The researchers believe that the other 80 percent of students come from district schools. Home schools are not considered as a source due to lack of data. Charter schools are found to be generating significant competitive effects for both traditional district schools as well as for private schools.
Date: 2006
Source: National Center for the Study of Privatization in Education
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