Headline from The Economist magazine: "Charter schools raise educational standards for vulnerable children"

From the Economist magazine:

charter school performance is not so “mixed” if you look at the data on a state-by-state basis, rather than across the country as a whole. States with reading and maths gains that were significantly higher for charter-school students than in traditional schools included Arkansas, Colorado (Denver), Illinois (Chicago), Louisiana and Missouri. . . . Since 1993 15% of charter schools have shut their gates, most because of low enrolment, a sign that the market is working. . . .

The national results would seem to work a lot better if they used fixed geographic effects.