A data point in the ongoing school debate

Recently the US Department of Education published a report, Comparing
Private Schools and Public Schools Using Hierarchical Linear Modeling. It concluded,

In grades 4 and 8 for both reading and mathematics, students in private schools achieved at higher levels than students in public schools. The average difference in school means ranged from almost 8 points for grade 4 mathematics, to about 18 points for grade 8 reading. The average differences were all statistically significant. Adjusting the comparisons for student characteristics resulted in reductions in all four average differences of approximately 11 to 14 points. Based on adjusted school means, the average for public schools was significantly higher than the average for private schools for grade 4 mathematics, while the average for private schools was significantly higher than the average for public schools for grade 8 reading. The average differences in adjusted school means for both grade 4 reading and grade 8 mathematics were not significantly different from zero.

Comparisons were also carried out with subsets of private schools categorized by sectarian affiliation. After adjusting for student characteristics, raw score average differences were reduced by about 11 to 15 points. In grade 4, Catholic and Lutheran schools were each compared to public schools. For both reading and mathematics, the results were generally similar to those based on all private schools. In grade 8, Catholic, Lutheran, and Conservative Christian schools were each compared to public schools. For Catholic and Lutheran schools for both reading and mathematics, the results were again similar to those based on all private schools. For Conservative Christian schools, the average adjusted school mean in reading was not significantly different from that of public schools. In mathematics, the average adjusted school mean for Conservative Christian schools was significantly lower than that of
public schools.

The New York Times reported that,

Reg Weaver, president of the National Education Association, the union for millions of teachers, said the findings showed that public schools were “doing an outstanding job.”

On the other hand,

A spokesman for the Education Department, Chad Colby, offered no praise for public schools and said he did not expect the findings to influence policy. Mr. Colby emphasized the caveat, “An overall comparison of the two types of schools is of modest utility.”

“We’re not just for public schools or private schools,’’ he said. “We’re for good schools.”

Amen to that.