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A new study released today by Caroline Hoxby, Professor of Economics at Harvard University and director of the Economics of Education Program at the National Bureau of Economic Research, shows that students in charter schools are more likely to be proficient on state math and reading assessments than those in neighboring traditional public schools. For example, it shows that students in charter schools that have been operating for 9 or more years are 10 percent more likely to be proficient in reading and math. The following are excerpts from the executive summary of the report, "Achievement in Charter Schools and Regular Public Schools in the United States: Understanding the Differences":
"Compared to students in the matched public school, charter students are 5.2 percent more likely to be proficient in reading and 3.2 percent more likely to be proficient in math on their state's exams. Charter schools that have been in operation longer have a greater proficiency advantage over the matched public schools. For example, in reading, the advantage is 2.5 percent for a charter school that has been operating 1 to 4 years, 5.2 percent for a school operating 5 to 8 years, and 10.1 percent for a school operating 9 to 11 years.
"The results show that charter schools are especially likely to raise the achievement of students who are poor or Hispanic. This is a useful finding because charter schools serve students who are disproportionately likely to be minorities or poor."
"In states where charter schools are well-established, charter school students' advantage in proficiency tends to be greater. For instance, in Arizona, fourth grade charter students are about 10 percent more likely to be proficient in reading and math than students in the matched regular public schools. In California, the corresponding proficiency advantages are 9 percent in reading and 5 percent in math. In Colorado, the corresponding proficiency advantages are 12 percent in reading and 14 percent in math."
"Because charter schools enroll only 1.5 percent of students, it is important to include nearly all of them in a study. Results based on only a small sample of charter school students (for instance, studies that rely on the 3 percent sample of the National Assessment of Educational Progress) cannot be used to draw conclusions about states' charter school policies. A study that relies on a 3 percent sample of 1.5 percent of American students is a study based on only 0.045 percent of students. In contrast, this study uses data that are sufficient for detailed investigations of charter school students' proficiency, nationwide."
The entire report is available online.
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