On the Public-Private School Achievement Debate

Paul E. Peterson and Elena Llaudet:

According to the NCES study, the performance of students attending private schools was superior to that of students attending public schools. But after statistical adjustments were made for student characteristics, the private school advantage among 4th-graders was reported to give way to a 4.5 point public school advantage in math and school-sector parity in reading. After the same adjustments were made for 8th-graders, private schools retained a 7 point advantage in reading but achieved only parity in math.

However, NCES’s measures of student characteristics are flawed by inconsistent classification across the public and private sectors and by the inclusion of factors open to school influence.

Utilizing the same data as the original study but substituting better measures of student characteristics, improved Alternative Models identify a private school advantage in 11 out of 12 public-private comparisons. In 8th-grade math, the private school advantage varies between 3 and 7 test points; in reading, it varies between 9 and 13 points. Among 4th graders, in math, parity is observed in one model, but private schools outperform public schools by 2 to 4 points in the other two models; in 4th-grade reading, private schools have an advantage that ranges from 6 to 10 points. Except when parity is observed, all differences are statistically significant.

Posted by Jim Zellmer at August 3, 2006 7:27 PM
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