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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http://www.goldwaterinstitute.org/article.php/431.html
This study examines the test scores of more than 60,000 Arizona students attending 873 charter and traditional public schools statewide over a three-year period. Its purpose is to determine the net effect of attending either type of school on reading achievement scores and total achievement growth over time. The researchers found that charter school students, on average, showed overall annual achievement growth roughly three points higher than their non-charter peers, despite beginning with lower test scores than their traditional public school counterparts. Charter school students who completed the twelfth grade surpassed traditional public school students on SAT-9 reading tests. Achievement growth varied by grade level. In the elementary grades, charter school students exhibited faster achievement growth than traditional public school students. Achievement growth in the middle grades was similar for both kinds of students, while high school achievement growth was higher for traditional public school students. Researchers suggest that one reason for this is that elementary charters are more likely to focus on academics, while middle and high school charters generally serve students who want vocational training, have been out of school, have learning or behavioral problems, or those who have been in the juvenile justice system.
Date: 2004
Source: Goldwater Institute
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