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.educationnext.org/20054/52.html
In a randomized study of Chicago charter schools, two economists find that charter students in K-5 outperformed their traditional school peers in reading and math. Students in charter schools outperformed a comparable group of lotteried-out students who remained in regular Chicago public schools by 5 to 6 percentile points in math and about 5 percentile points in reading. That translates into gains by 2.5 to 3 percentile points for each year spent in a charter school. This is the first significant study that used a lottery-based approach to evaluate achievement differences. The “treatment” group was comprised of applicants who drew a lottery number that earned them a place at one of the charter schools and the control group was comprised of applicants who were lotteried-out (not selected). This allowed the researchers to be confident that the groups are comparable in several ways, including race, income, and motivation.
Date: 2005
Source: Hoover Institution, Stanford University
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