Reanalysis of NAEP Scores Finds Charter Schools Lagging

Study initiated by NCES revisits data underlying controversy in 2004.

A federal reanalysis of 2003 test-score data from the National Assessment of Educational Progress finds that charter schools trailed regular public schools that year in student achievement in both reading and mathematics.

The average reading score for the 150 charter schools examined, taking into account a range of background characteristics of students and schools, was 4.2 percentage points lower than in a pool of more than 6,700 regular public schools, according to the report released last week by the National Center for Education Statistics, an arm of the U.S. Department of Education. In mathematics, the charters scored 4.7 percentage points lower.

The study used data from the 2003 administration of the 4th grade NAEP, which included a special oversampling of charter schools to allow for comparisons between regular and charter public schools. The 150 charters are...

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Correction: 
This article presented data on student test scores incorrectly. The study found that 4th grade students in a nationally representative sample of charter schools scored 4.2 points behind students in regular public schools on the National Assessment of Educational Progress in reading, and 4.7 points behind regular public-school students in mathematics, when various student characteristics were considered. Those score differences were measured on the NAEP achievement scale of zero to 500.

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