Tag: charles murray

Throwdown with Charles Murray

In a response to my post this morning, Charles Murray remains unconvinced that changes to our school system could result in dramatic improvements in educational outcomes.

He asks to see the scholarly study showing that a school has miraculously boosted achievement above the norm. In one way, this hurdle is too low, and in another it’s too high.

If we could only point to a single study of a single school, it wouldn’t instill much confidence in the generalizability of the phenomenon. A consistent pattern of scholarly results is necessary for that. On the other hand, asking for “miraculous” improvement is a needlessly high standard. My disagreement is with Murray’s earlier, lower threshold claim that:  “reforms of the schools can never do more than produce score improvements at the margin.”

Let’s call a marginal improvement an increase of less than .15  standard deviations above the current mean (typically considered a “small” effect in the social sciences). Taking that as our litmus test, is there a consistent pattern of scholarly evidence that better school system design can boost achievement by more than .15 standard deviations? Yes.

education markets v monopolies -- coulson

That pattern is presented in the figure above, drawn from my recent review of the global econometric literature comparing educational outcomes across different types of school systems. The figure relates the number of statistically significant findings favoring free education markets over state school monopolies (in white), significant findings of the reverse (in light grey), and insignificant findings (in dark grey). Markets beat monopolies by a ratio of 15 significant findings to 1, across the seven educational measures for which data are available.

While a few of these findings have small effect sizes, many are above .15 standard deviations – some of them well above it. A paper by Tooley, Dixon, Bao, and Merrifield (under consideration by the journal Economics of Education Review), for instance, finds that in Nigeria private schools outscore public schools by double that amount, after controls, while “in Delhi and Hyderabad private unrecognized schools top state-run schools in math instruction by about 2/3 of a standard deviation.” A recent randomized assignment study of the DC voucher program finds that voucher students who’ve been in the program for three years are reading two grade levels ahead of their public school peers (.42 std deviations), though the average voucher is worth only a quarter of what DC spends per pupil on public k-12 education.

These are more than marginal improvements, and they are part of a consistent pattern. That pattern strongly suggests that moving from our current monopoly school system to a free and competitive education marketplace would shift the bell curve of academic achievement significantly to the right, raising the mean achievement substantially above its current level.

No one should be surprised by that. Imagine how far the bell curve for median income across modern nations would shift to the left if all free markets were supplanted with centrally planned monopolies such as have ruined the economies of Cuba, North Korea, and until recently many other nations.

We Are not Seeing the Bell Curve’s Toll

Ben ChavisLast week, I posted a chart on this blog showing the percent change in federal education spending and student achievement since 1970 (achievement has been flat while federal education spending has nearly tripled).

After laughing out loud when he saw it, IQ expert and Bell Curve author Charles Murray mused that “such a huge proportion of a child’s educational prospects are determined by things other than school (genes and the non-school environment) that reforms of the schools can never do more than produce score improvements at the margin.”

But consider the accomplishments of Ben Chavis, who spoke at Cato last Friday. When he took over the American Indian Public Charter School in Oakland in 2001, it was the worst school in the district. Under his leadership (imagine a hybrid of Socrates and Dirty Harry), the school’s scores rose dramatically year after year. Within seven years, it had become the fifth highest-scoring middle school in the state – though continuing to enroll a student population that is overwhelmingly poor and minority.

It was not a freak occurrence. Chavis did it again, and again: creating a second AIPCS middle school as well as a high school, both of which are also among the top schools in the state, and both of which also enroll chiefly low income minority students.

Murray has made a compelling case over the years that IQ is real, strongly tied to academic achievement, and determined in significant measure by nature and home environment. But academic achievement is also powerfully determined by schooling. Typical U.S. test score data camouflage the significance of schooling because so many schools are so amazingly bad at maximizing academic achievement – especially for poor minority students.

But Chavis – and others before him and alongside him today – have shown how to do it: instill in the school environment those cultural characteristics necessary for academic success that are missing in the home.

In a free enterprise school system that would automatically disseminate and perpetuate great schools like Ben’s, average test scores would rise dramatically above their current levels. The Bell Curve would be shifted dramatically to the right.