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://papers.nber.org/papers/w9683
This paper investigates how the introduction of charter schools in North Carolina affects the performance of traditional public schools on statewide assessments. Using end-of-year test scores for grades three through eight from North Carolina's state testing program, researchers found that charter school competition raised the composite test scores in district schools, even though the students leaving district schools for the charters tended to have above average test scores. The introduction of charter schools in the state caused an approximate one percent increase in the score, which constitutes about one quarter of the average yearly growth. The gain was roughly two to five times greater than the gain from decreasing the student-faculty ratio by 1.
Date: 2004
Source: National Bureau of Economic Research
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